{"containers":{"cna":{"affected":[{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.HtmlSanitizeEx.Scrubber.CSS'","'Elixir.HtmlSanitizeEx'"],"packageName":"html_sanitize_ex","packageURL":"pkg:hex/html_sanitize_ex","product":"html_sanitize_ex","programFiles":["lib/html_sanitize_ex/scrubber/css.ex","lib/html_sanitize_ex.ex"],"programRoutines":[{"name":"'Elixir.HtmlSanitizeEx.Scrubber.CSS':scrub/1"},{"name":"'Elixir.HtmlSanitizeEx':html5/1"}],"repo":"https://github.com/rrrene/html_sanitize_ex","vendor":"rrrene","versions":[{"lessThan":"1.5.4","status":"affected","version":"0.3.1","versionType":"semver"}]},{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.HtmlSanitizeEx.Scrubber.CSS'","'Elixir.HtmlSanitizeEx'"],"packageName":"rrrene/html_sanitize_ex","packageURL":"pkg:github/rrrene/html_sanitize_ex","product":"html_sanitize_ex","programFiles":["lib/html_sanitize_ex/scrubber/css.ex","lib/html_sanitize_ex.ex"],"programRoutines":[{"name":"'Elixir.HtmlSanitizeEx.Scrubber.CSS':scrub/1"},{"name":"'Elixir.HtmlSanitizeEx':html5/1"}],"repo":"https://github.com/rrrene/html_sanitize_ex","vendor":"rrrene","versions":[{"lessThan":"0b9f9ad63a7529d4f2c3c1134c371adc3e654308","status":"affected","version":"21f90012eb21aa36f4e3701b7547e12faf0f3c8b","versionType":"git"}]}],"configurations":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<p>Only <code>HtmlSanitizeEx.html5/1</code>, and custom scrubbers declared with <code>use HtmlSanitizeEx, extend: :html5</code>, permit <code>&lt;style&gt;</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>"},{"base64":false,"type":"text/markdown","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."}],"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."}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*","versionEndExcluding":"1.5.4","versionStartIncluding":"0.3.1","vulnerable":true}],"negate":false,"operator":"OR"}],"operator":"AND"}],"credits":[{"lang":"en","type":"finder","value":"Peter Ullrich"},{"lang":"en","type":"analyst","value":"Jonatan Männchen / EEF"},{"lang":"en","type":"remediation developer","value":"René Föhring"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","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>&lt;style&gt;</code> element and no script executes.</p>\n<p>This issue affects html_sanitize_ex: from 0.3.1 before 1.5.4.</p>"},{"base64":false,"type":"text/markdown","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 1.5.4."}],"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 1.5.4."}],"impacts":[{"capecId":"CAPEC-148","descriptions":[{"lang":"en","value":"CAPEC-148 Content Spoofing"}]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":2.3,"baseSeverity":"LOW","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-74","description":"CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-08-06T15:08:58.171Z","orgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","shortName":"EEF"},"references":[{"tags":["vendor-advisory","related"],"url":"https://github.com/rrrene/html_sanitize_ex/security/advisories/GHSA-87v2-pfhj-r5x7"},{"tags":["related"],"url":"https://cna.erlef.org/cves/CVE-2026-68747.html"},{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-68747"},{"tags":["patch"],"url":"https://github.com/rrrene/html_sanitize_ex/commit/0b9f9ad63a7529d4f2c3c1134c371adc3e654308"}],"source":{"discovery":"EXTERNAL"},"title":"CSS sanitizer allowlist bypass in html_sanitize_ex via non-declaration input","workarounds":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","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>&lt;style&gt;</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>"},{"base64":false,"type":"text/markdown","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."}],"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."}]}},"cveMetadata":{"assignerOrgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","assignerShortName":"EEF","cveId":"CVE-2026-68747","datePublished":"2026-08-06T14:50:03.143Z","dateReserved":"2026-07-31T13:23:00.355Z","dateUpdated":"2026-08-06T15:08:58.171Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"}