342 lines
18 KiB
JSON
342 lines
18 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-66843",
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"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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"state": "PUBLISHED",
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"assignerShortName": "EEF",
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"dateReserved": "2026-08-06T09:00:01.259Z",
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"datePublished": "2026-08-06T14:48:20.513Z",
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"dateUpdated": "2026-08-19T11:51:46.161Z"
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},
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"containers": {
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"cna": {
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"affected": [
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{
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"collectionURL": "https://repo.hex.pm",
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"cpes": [
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"cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"Elixir.HtmlSanitizeEx.Scrubber.HTML5",
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"Elixir.HtmlSanitizeEx"
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],
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"packageName": "html_sanitize_ex",
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"packageURL": "pkg:hex/html_sanitize_ex",
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"product": "html_sanitize_ex",
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"programFiles": [
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"lib/html_sanitize_ex/scrubber/html5.ex",
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"lib/html_sanitize_ex.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.HtmlSanitizeEx.Scrubber.HTML5':scrub_attribute/2"
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},
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{
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"name": "'Elixir.HtmlSanitizeEx.Scrubber.HTML5':sanitize/1"
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},
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{
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"name": "'Elixir.HtmlSanitizeEx':html5/1"
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}
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],
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"repo": "https://github.com/rrrene/html_sanitize_ex",
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"vendor": "rrrene",
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"versions": [
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{
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"lessThan": "1.4.5",
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"status": "affected",
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"version": "0.3.1",
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"versionType": "semver"
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},
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{
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"lessThan": "1.5.3",
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"status": "affected",
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"version": "1.5.0-rc.0",
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"versionType": "semver"
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}
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]
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},
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{
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"collectionURL": "https://github.com",
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"cpes": [
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"cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"modules": [
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"Elixir.HtmlSanitizeEx.Scrubber.HTML5",
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"Elixir.HtmlSanitizeEx"
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],
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"packageName": "rrrene/html_sanitize_ex",
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"packageURL": "pkg:github/rrrene/html_sanitize_ex",
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"product": "html_sanitize_ex",
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"programFiles": [
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"lib/html_sanitize_ex/scrubber/html5.ex",
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"lib/html_sanitize_ex.ex"
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],
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"programRoutines": [
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{
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"name": "'Elixir.HtmlSanitizeEx.Scrubber.HTML5':scrub_attribute/2"
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},
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{
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"name": "'Elixir.HtmlSanitizeEx.Scrubber.HTML5':sanitize/1"
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},
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{
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"name": "'Elixir.HtmlSanitizeEx':html5/1"
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}
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],
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"repo": "https://github.com/rrrene/html_sanitize_ex",
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"vendor": "rrrene",
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"versions": [
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{
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"changes": [
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{
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"at": "bec27fec4de99e40c68c4285a610e09e791a3eaf",
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"status": "unaffected"
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},
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{
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"at": "ce038aa1af5a960d50f8eb5d368cc57bb2b9a9f0",
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"status": "unaffected"
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}
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],
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"lessThan": "*",
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"status": "affected",
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"version": "8976d64ea0b77d26093a94a43ec48a3978e8d028",
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"versionType": "git"
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}
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]
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}
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],
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"configurations": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p>Only <code>HtmlSanitizeEx.html5/1</code>, and custom scrubbers declared with <code>use HtmlSanitizeEx, extend: :html5</code>, allow the <code>object</code> element, and the sanitized output must be rendered to other users.</p>\n<p>Script execution in the host origin additionally requires the application to serve attacker-controlled HTML from a same-origin path, such as an uploads directory served as <code>text/html</code>.</p>"
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},
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{
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"base64": false,
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"type": "text/markdown",
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"value": "Only `HtmlSanitizeEx.html5/1`, and custom scrubbers declared with `use HtmlSanitizeEx, extend: :html5`, allow the `object` element, and the sanitized output must be rendered to other users.\n\nScript execution in the host origin additionally requires the application to serve attacker-controlled HTML from a same-origin path, such as an uploads directory served as `text/html`."
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}
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],
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"value": "Only HtmlSanitizeEx.html5/1, and custom scrubbers declared with use HtmlSanitizeEx, extend: :html5, allow the object element, and the sanitized output must be rendered to other users.\n\nScript execution in the host origin additionally requires the application to serve attacker-controlled HTML from a same-origin path, such as an uploads directory served as text/html."
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"cpeMatch": [
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{
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"criteria": "cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "1.4.5",
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"versionStartIncluding": "0.3.1",
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"vulnerable": true
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},
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{
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"criteria": "cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*",
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"versionEndExcluding": "1.5.3",
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"versionStartIncluding": "1.5.0-rc.0",
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"vulnerable": true
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}
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],
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"negate": false,
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"operator": "OR"
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}
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],
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"operator": "AND"
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}
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],
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"credits": [
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{
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"lang": "en",
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"type": "finder",
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"value": "Peter Ullrich"
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},
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{
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"lang": "en",
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"type": "remediation developer",
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"value": "René Föhring"
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},
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{
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"lang": "en",
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"type": "analyst",
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"value": "Jonatan Männchen / EEF"
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}
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],
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"descriptions": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p>Inclusion of Functionality from Untrusted Control Sphere vulnerability in the HTML5 scrubber in rrrene html_sanitize_ex allows a remote attacker to load a document of their choosing into a trusted page via the <code>data</code> attribute of an <code><object></code> element in sanitized HTML. <code>object</code> is the one URI-bearing element in <code>lib/html_sanitize_ex/scrubber/html5.ex</code> never registered through <code>allow_tag_with_uri_attributes/3</code>, and its only guard is a prefix match on lowercase <code>\"javascript:\"</code>, so mixed-case variants, <code>data:</code> URIs, protocol-relative URLs and same-origin paths all survive.</p>\n<p>This is not unconditional cross-site scripting. A <code>javascript:</code> URL does not execute through <code><object data></code> in current browsers, <code>data:</code> documents load in an opaque origin, and host-origin script execution additionally requires the application to serve attacker-controlled content from a same-origin path.</p>\n<p>This issue affects html_sanitize_ex: from 0.3.1 before 1.4.5 and from 1.5.0-rc.0 before 1.5.3.</p>"
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},
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{
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"base64": false,
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"type": "text/markdown",
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"value": "Inclusion of Functionality from Untrusted Control Sphere vulnerability in the HTML5 scrubber in rrrene html_sanitize_ex allows a remote attacker to load a document of their choosing into a trusted page via the `data` attribute of an `<object>` element in sanitized HTML. `object` is the one URI-bearing element in `lib/html_sanitize_ex/scrubber/html5.ex` never registered through `allow_tag_with_uri_attributes/3`, and its only guard is a prefix match on lowercase `\"javascript:\"`, so mixed-case variants, `data:` URIs, protocol-relative URLs and same-origin paths all survive.\n\nThis is not unconditional cross-site scripting. A `javascript:` URL does not execute through `<object data>` in current browsers, `data:` documents load in an opaque origin, and host-origin script execution additionally requires the application to serve attacker-controlled content from a same-origin path.\n\nThis issue affects html_sanitize_ex: from 0.3.1 before 1.4.5 and from 1.5.0-rc.0 before 1.5.3."
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}
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],
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"value": "Inclusion of Functionality from Untrusted Control Sphere vulnerability in the HTML5 scrubber in rrrene html_sanitize_ex allows a remote attacker to load a document of their choosing into a trusted page via the data attribute of an <object> element in sanitized HTML. object is the one URI-bearing element in lib/html_sanitize_ex/scrubber/html5.ex never registered through allow_tag_with_uri_attributes/3, and its only guard is a prefix match on lowercase \"javascript:\", so mixed-case variants, data: URIs, protocol-relative URLs and same-origin paths all survive.\n\nThis is not unconditional cross-site scripting. A javascript: URL does not execute through <object data> in current browsers, data: documents load in an opaque origin, and host-origin script execution additionally requires the application to serve attacker-controlled content from a same-origin path.\n\nThis issue affects html_sanitize_ex: from 0.3.1 before 1.4.5 and from 1.5.0-rc.0 before 1.5.3."
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}
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],
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"impacts": [
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{
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"capecId": "CAPEC-175",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-175 Code Inclusion"
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}
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]
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}
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],
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"metrics": [
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{
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"cvssV4_0": {
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"Automatable": "NOT_DEFINED",
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"Recovery": "NOT_DEFINED",
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"Safety": "NOT_DEFINED",
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"attackComplexity": "LOW",
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"attackRequirements": "PRESENT",
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"attackVector": "NETWORK",
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"baseScore": 2.3,
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"baseSeverity": "LOW",
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"privilegesRequired": "NONE",
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"providerUrgency": "NOT_DEFINED",
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"subAvailabilityImpact": "NONE",
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"subConfidentialityImpact": "LOW",
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"subIntegrityImpact": "LOW",
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"userInteraction": "PASSIVE",
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"valueDensity": "NOT_DEFINED",
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
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"version": "4.0",
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"vulnAvailabilityImpact": "NONE",
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"vulnConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "NONE",
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"vulnerabilityResponseEffort": "NOT_DEFINED"
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},
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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]
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-829",
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"description": "CWE-829 Inclusion of Functionality from Untrusted Control Sphere",
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"lang": "en",
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"type": "CWE"
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}
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]
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}
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],
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"providerMetadata": {
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"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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"shortName": "EEF",
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"dateUpdated": "2026-08-19T11:51:46.161Z"
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},
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"references": [
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{
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"tags": [
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"vendor-advisory",
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"related"
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],
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"url": "https://github.com/rrrene/html_sanitize_ex/security/advisories/GHSA-xmm9-jc22-rcgj"
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},
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{
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"tags": [
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"related"
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],
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"url": "https://cna.erlef.org/cves/CVE-2026-66843.html"
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},
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{
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"tags": [
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"related"
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],
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"url": "https://osv.dev/vulnerability/EEF-CVE-2026-66843"
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},
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{
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"tags": [
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"patch"
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],
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"url": "https://github.com/rrrene/html_sanitize_ex/commit/bec27fec4de99e40c68c4285a610e09e791a3eaf"
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},
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{
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"tags": [
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"patch"
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],
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"url": "https://github.com/rrrene/html_sanitize_ex/commit/ce038aa1af5a960d50f8eb5d368cc57bb2b9a9f0"
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}
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],
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"source": {
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"discovery": "EXTERNAL"
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},
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"title": "html_sanitize_ex HTML5 scrubber keeps attacker-supplied `<object>` elements, allowing untrusted content embedding",
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"workarounds": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p>Sanitize with <code>basic_html/1</code>, <code>markdown_html/1</code> or <code>strip_tags/1</code>, none of which allow <code>object</code>, or define a custom scrubber that omits it.</p>\n<p>A Content-Security-Policy of <code>object-src 'none'</code> blocks an injected <code><object></code> from loading, and hosting user uploads on a separate origin removes the escalation path.</p>"
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},
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{
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"base64": false,
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"type": "text/markdown",
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"value": "Sanitize with `basic_html/1`, `markdown_html/1` or `strip_tags/1`, none of which allow `object`, or define a custom scrubber that omits it.\n\nA Content-Security-Policy of `object-src 'none'` blocks an injected `<object>` from loading, and hosting user uploads on a separate origin removes the escalation path."
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}
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],
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"value": "Sanitize with basic_html/1, markdown_html/1 or strip_tags/1, none of which allow object, or define a custom scrubber that omits it.\n\nA Content-Security-Policy of object-src 'none' blocks an injected <object> from loading, and hosting user uploads on a separate origin removes the escalation path."
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}
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]
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-08-06T15:40:41.682905Z",
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"id": "CVE-2026-66843",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-08-06T15:40:50.570Z"
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}
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}
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]
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}
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} |