{"containers":{"cna":{"affected":[{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["Elixir.HtmlSanitizeEx.Scrubber.HTML5","Elixir.HtmlSanitizeEx"],"packageName":"html_sanitize_ex","packageURL":"pkg:hex/html_sanitize_ex","product":"html_sanitize_ex","programFiles":["lib/html_sanitize_ex/scrubber/html5.ex","lib/html_sanitize_ex.ex"],"programRoutines":[{"name":"'Elixir.HtmlSanitizeEx.Scrubber.HTML5':scrub_attribute/2"},{"name":"'Elixir.HtmlSanitizeEx.Scrubber.HTML5':sanitize/1"},{"name":"'Elixir.HtmlSanitizeEx':html5/1"}],"repo":"https://github.com/rrrene/html_sanitize_ex","vendor":"rrrene","versions":[{"lessThan":"1.5.3","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.HTML5","Elixir.HtmlSanitizeEx"],"packageName":"rrrene/html_sanitize_ex","packageURL":"pkg:github/rrrene/html_sanitize_ex","product":"html_sanitize_ex","programFiles":["lib/html_sanitize_ex/scrubber/html5.ex","lib/html_sanitize_ex.ex"],"programRoutines":[{"name":"'Elixir.HtmlSanitizeEx.Scrubber.HTML5':scrub_attribute/2"},{"name":"'Elixir.HtmlSanitizeEx.Scrubber.HTML5':sanitize/1"},{"name":"'Elixir.HtmlSanitizeEx':html5/1"}],"repo":"https://github.com/rrrene/html_sanitize_ex","vendor":"rrrene","versions":[{"lessThan":"9f7e38be51edc38f132dfe994f37af5cf5e0e76f","status":"affected","version":"8976d64ea0b77d26093a94a43ec48a3978e8d028","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>, allow the <code>meta</code> element, and the sanitized output must be rendered to other users.</p>"},{"base64":false,"type":"text/markdown","value":"Only `HtmlSanitizeEx.html5/1`, and custom scrubbers declared with `use HtmlSanitizeEx, extend: :html5`, allow the `meta` element, and the sanitized output must be rendered to other users."}],"value":"Only HtmlSanitizeEx.html5/1, and custom scrubbers declared with use HtmlSanitizeEx, extend: :html5, allow the meta element, and the sanitized output must be rendered to other users."}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:rrrene:html_sanitize_ex:*:*:*:*:*:*:*:*","versionEndExcluding":"1.5.3","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>URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the HTML5 scrubber in rrrene html_sanitize_ex allows a remote attacker to force visitors of a page to navigate to a site of the attacker's choosing via a <code>&lt;meta http-equiv=\"refresh\"&gt;</code> element in sanitized HTML. <code>HtmlSanitizeEx.html5/1</code> keeps attacker-supplied <code>&lt;meta&gt;</code> elements in its output. A <code>meta</code> element acts on the whole document rather than on the fragment it was embedded in, so it can also declare document-wide directives such as <code>Content-Security-Policy</code>.</p>\n<p>This is not cross-site scripting. Browsers do not navigate a meta refresh to a <code>javascript:</code> URL, so the uppercase <code>JAVASCRIPT:</code> filter bypass yields no script execution and none was demonstrated.</p>\n<p>This issue affects html_sanitize_ex: from 0.3.1 before 1.5.3.</p>"},{"base64":false,"type":"text/markdown","value":"URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the HTML5 scrubber in rrrene html_sanitize_ex allows a remote attacker to force visitors of a page to navigate to a site of the attacker's choosing via a `<meta http-equiv=\"refresh\">` element in sanitized HTML. `HtmlSanitizeEx.html5/1` keeps attacker-supplied `<meta>` elements in its output. A `meta` element acts on the whole document rather than on the fragment it was embedded in, so it can also declare document-wide directives such as `Content-Security-Policy`.\n\nThis is not cross-site scripting. Browsers do not navigate a meta refresh to a `javascript:` URL, so the uppercase `JAVASCRIPT:` filter bypass yields no script execution and none was demonstrated.\n\nThis issue affects html_sanitize_ex: from 0.3.1 before 1.5.3."}],"value":"URL Redirection to Untrusted Site ('Open Redirect') vulnerability in the HTML5 scrubber in rrrene html_sanitize_ex allows a remote attacker to force visitors of a page to navigate to a site of the attacker's choosing via a <meta http-equiv=\"refresh\"> element in sanitized HTML. HtmlSanitizeEx.html5/1 keeps attacker-supplied <meta> elements in its output. A meta element acts on the whole document rather than on the fragment it was embedded in, so it can also declare document-wide directives such as Content-Security-Policy.\n\nThis is not cross-site scripting. Browsers do not navigate a meta refresh to a javascript: URL, so the uppercase JAVASCRIPT: filter bypass yields no script execution and none was demonstrated.\n\nThis issue affects html_sanitize_ex: from 0.3.1 before 1.5.3."}],"impacts":[{"capecId":"CAPEC-154","descriptions":[{"lang":"en","value":"CAPEC-154 Resource Location 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":"NONE","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:N/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-601","description":"CWE-601 URL Redirection to Untrusted Site ('Open Redirect')","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-08-06T14:49:23.468Z","orgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","shortName":"EEF"},"references":[{"tags":["vendor-advisory","related"],"url":"https://github.com/rrrene/html_sanitize_ex/security/advisories/GHSA-2c6f-3j54-xpcr"},{"tags":["related"],"url":"https://cna.erlef.org/cves/CVE-2026-66829.html"},{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-66829"},{"tags":["patch"],"url":"https://github.com/rrrene/html_sanitize_ex/commit/9f7e38be51edc38f132dfe994f37af5cf5e0e76f"}],"source":{"discovery":"EXTERNAL"},"title":"html_sanitize_ex HTML5 scrubber keeps attacker-supplied meta refresh, allowing forced cross-origin redirection","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>meta</code>, or define a custom scrubber that omits it.</p>"},{"base64":false,"type":"text/markdown","value":"Sanitize with `basic_html/1`, `markdown_html/1` or `strip_tags/1`, none of which allow `meta`, or define a custom scrubber that omits it."}],"value":"Sanitize with basic_html/1, markdown_html/1 or strip_tags/1, none of which allow meta, or define a custom scrubber that omits it."}]}},"cveMetadata":{"assignerOrgId":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","assignerShortName":"EEF","cveId":"CVE-2026-66829","datePublished":"2026-08-06T14:49:23.468Z","dateReserved":"2026-08-06T08:15:02.719Z","dateUpdated":"2026-08-06T14:49:23.468Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"}