336 lines
18 KiB
JSON
336 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-2026-68747",
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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": "2026-07-31T13:23:00.355Z",
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"datePublished": "2026-08-06T14:50:03.143Z",
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"dateUpdated": "2026-08-19T11:50:10.843Z"
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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.CSS'",
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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/css.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.CSS':scrub/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": "1.5.4",
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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.CSS'",
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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/css.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.CSS':scrub/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": "0b9f9ad63a7529d4f2c3c1134c371adc3e654308",
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"status": "unaffected"
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},
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{
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"at": "c311a499db0b0baef06493fb3cfeb730c0f18f28",
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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": "21f90012eb21aa36f4e3701b7547e12faf0f3c8b",
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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>, permit <code><style></code> elements, and the sanitized output must be rendered to other users. Applications calling <code>HtmlSanitizeEx.Scrubber.CSS.scrub/1</code> directly are also affected.</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`, permit `<style>` elements, and the sanitized output must be rendered to other users. Applications calling `HtmlSanitizeEx.Scrubber.CSS.scrub/1` directly are also affected."
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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, permit <style> elements, and the sanitized output must be rendered to other users. Applications calling HtmlSanitizeEx.Scrubber.CSS.scrub/1 directly are also affected."
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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": "1.5.4",
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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>Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') vulnerability in the CSS scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to inject CSS at-rules, including an import of a remote stylesheet, into a page served to other users. <code>HtmlSanitizeEx.Scrubber.CSS.scrub/1</code> applies its property and value allowlist through a <code>Regex.replace</code> over substrings matching a <code>property: value</code> declaration pattern, so input that does not match that pattern is never inspected and is copied to the output unchanged. <code>@import url(//attacker.example/style.css);</code> survives, while the same URL inside a <code>background: url(...)</code> declaration is removed.</p>\n<p>Element boundaries are resolved before the scrubber runs, so injected content does not escape the <code><style></code> element and no script executes.</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 1.5.4.</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": "Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') vulnerability in the CSS scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to inject CSS at-rules, including an import of a remote stylesheet, into a page served to other users. `HtmlSanitizeEx.Scrubber.CSS.scrub/1` applies its property and value allowlist through a `Regex.replace` over substrings matching a `property: value` declaration pattern, so input that does not match that pattern is never inspected and is copied to the output unchanged. `@import url(//attacker.example/style.css);` survives, while the same URL inside a `background: url(...)` declaration is removed.\n\nElement boundaries are resolved before the scrubber runs, so injected content does not escape the `<style>` element and no script executes.\n\nThis issue affects html_sanitize_ex: from 0.3.1 before 1.4.5 and from 1.5.0-rc.0 before 1.5.4."
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}
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],
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"value": "Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') vulnerability in the CSS scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to inject CSS at-rules, including an import of a remote stylesheet, into a page served to other users. HtmlSanitizeEx.Scrubber.CSS.scrub/1 applies its property and value allowlist through a Regex.replace over substrings matching a property: value declaration pattern, so input that does not match that pattern is never inspected and is copied to the output unchanged. @import url(//attacker.example/style.css); survives, while the same URL inside a background: url(...) declaration is removed.\n\nElement boundaries are resolved before the scrubber runs, so injected content does not escape the <style> element and no script executes.\n\nThis issue affects html_sanitize_ex: from 0.3.1 before 1.4.5 and from 1.5.0-rc.0 before 1.5.4."
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}
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],
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"impacts": [
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{
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"capecId": "CAPEC-148",
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"descriptions": [
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{
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"lang": "en",
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"value": "CAPEC-148 Content 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": 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-74",
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"description": "CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')",
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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": "2026-08-19T11:50:10.843Z"
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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-87v2-pfhj-r5x7"
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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-2026-68747.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-2026-68747"
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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/0b9f9ad63a7529d4f2c3c1134c371adc3e654308"
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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/c311a499db0b0baef06493fb3cfeb730c0f18f28"
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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": "CSS sanitizer allowlist bypass in html_sanitize_ex via non-declaration input",
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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><style></code> elements, or define a custom scrubber that omits it.</p>\n<p>A Content-Security-Policy <code>style-src</code> directive that permits no external stylesheet origins stops an injected <code>@import</code> from loading, though injected inline rules still apply.</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 `<style>` elements, or define a custom scrubber that omits it.\n\nA Content-Security-Policy `style-src` directive that permits no external stylesheet origins stops an injected `@import` from loading, though injected inline rules still apply."
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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 <style> elements, or define a custom scrubber that omits it.\n\nA Content-Security-Policy style-src directive that permits no external stylesheet origins stops an injected @import from loading, though injected inline rules still apply."
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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": "2026-08-06T15:43:31.189847Z",
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"id": "CVE-2026-68747",
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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": "2026-08-06T15:43:37.237Z"
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}
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}
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]
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}
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} |