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-2026-66370",
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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": "2026-08-06T10:15:01.808Z",
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"datePublished": "2026-08-06T14:49:15.841Z",
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"dateUpdated": "2026-08-19T11:51:08.771Z"
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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": "a1e804ed997e780ea71d14393cf2f701330553a6",
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"status": "unaffected"
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},
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{
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"at": "21394e758cb0ffe12fb9953c30fdedc6016c8f9e",
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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>input</code> element, and the sanitized output must be rendered to other users.</p>\n<p>The rendering page must also contain a form with an <code>id</code>, since that <code>id</code> is what the injected <code>form</code> attribute binds to.</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 `input` element, and the sanitized output must be rendered to other users.\n\nThe rendering page must also contain a form with an `id`, since that `id` is what the injected `form` attribute binds to."
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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 input element, and the sanitized output must be rendered to other users.\n\nThe rendering page must also contain a form with an id, since that id is what the injected form attribute binds to."
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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": "analyst",
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"value": "Jonatan Männchen / EEF"
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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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"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>URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the HTML5 scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to retarget a form already on the rendering page and receive whatever the victim submits, including credentials, via the <code>form</code> and <code>formaction</code> attributes on an <code><input></code> element in sanitized HTML. HTML's <code>form</code> attribute associates an input with any form on the page by its <code>id</code> even when the input sits outside that form, and <code>formaction</code> on a submit control overrides the owning form's <code>action</code>. Neither attribute receives a scheme check, so an absolute cross-origin URL survives sanitizing.</p>\n<p>No script executes. The scrubber allows neither <code>form</code> nor <code>button</code>, so the attacker cannot introduce a form of their own and the rendering page must already contain a form carrying an <code>id</code>.</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": "URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the HTML5 scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to retarget a form already on the rendering page and receive whatever the victim submits, including credentials, via the `form` and `formaction` attributes on an `<input>` element in sanitized HTML. HTML's `form` attribute associates an input with any form on the page by its `id` even when the input sits outside that form, and `formaction` on a submit control overrides the owning form's `action`. Neither attribute receives a scheme check, so an absolute cross-origin URL survives sanitizing.\n\nNo script executes. The scrubber allows neither `form` nor `button`, so the attacker cannot introduce a form of their own and the rendering page must already contain a form carrying an `id`.\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": "URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the HTML5 scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to retarget a form already on the rendering page and receive whatever the victim submits, including credentials, via the form and formaction attributes on an <input> element in sanitized HTML. HTML's form attribute associates an input with any form on the page by its id even when the input sits outside that form, and formaction on a submit control overrides the owning form's action. Neither attribute receives a scheme check, so an absolute cross-origin URL survives sanitizing.\n\nNo script executes. The scrubber allows neither form nor button, so the attacker cannot introduce a form of their own and the rendering page must already contain a form carrying an id.\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-154",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-154 Resource Location Spoofing"
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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": 4.8,
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"baseSeverity": "MEDIUM",
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"privilegesRequired": "NONE",
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"providerUrgency": "NOT_DEFINED",
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"subAvailabilityImpact": "NONE",
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"subConfidentialityImpact": "HIGH",
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"subIntegrityImpact": "LOW",
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"userInteraction": "ACTIVE",
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"valueDensity": "NOT_DEFINED",
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/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-601",
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"description": "CWE-601 URL Redirection to Untrusted Site ('Open Redirect')",
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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": "2026-08-19T11:51:08.771Z"
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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-w3f9-jjhw-wwvq"
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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-2026-66370.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-2026-66370"
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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/a1e804ed997e780ea71d14393cf2f701330553a6"
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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/21394e758cb0ffe12fb9953c30fdedc6016c8f9e"
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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 form-association attributes, allowing form hijacking",
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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>input</code>, or define a custom scrubber that omits it.</p>\n<p>Omitting the <code>id</code> attribute from the page's own forms, or giving them values an attacker cannot predict, removes the anchor the injected <code>form</code> attribute needs.</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 `input`, or define a custom scrubber that omits it.\n\nOmitting the `id` attribute from the page's own forms, or giving them values an attacker cannot predict, removes the anchor the injected `form` attribute needs."
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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 input, or define a custom scrubber that omits it.\n\nOmitting the id attribute from the page's own forms, or giving them values an attacker cannot predict, removes the anchor the injected form attribute needs."
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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": "2026-08-06T15:42:03.803831Z",
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"id": "CVE-2026-66370",
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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": "2026-08-06T15:42:09.603Z"
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}
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}
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]
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}
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} |