{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-73491","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-08-12T19:00:33.735Z","datePublished":"2026-08-12T20:59:18.589Z","dateUpdated":"2026-08-13T13:49:22.724Z"},"containers":{"cna":{"title":"Loofah `allowed_uri?` does not detect `javascript:` URIs split by named whitespace character references","problemTypes":[{"descriptions":[{"cweId":"CWE-184","lang":"en","description":"CWE-184: Incomplete List of Disallowed Inputs","type":"CWE"}]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","subAvailabilityImpact":"NONE","baseScore":2.3,"baseSeverity":"LOW","vectorString":"CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0"}}],"references":[{"name":"https://github.com/flavorjones/loofah/security/advisories/GHSA-8whx-365g-h9vv","tags":["x_refsource_CONFIRM"],"url":"https://github.com/flavorjones/loofah/security/advisories/GHSA-8whx-365g-h9vv"},{"name":"https://github.com/flavorjones/loofah/pull/308","tags":["x_refsource_MISC"],"url":"https://github.com/flavorjones/loofah/pull/308"},{"name":"https://github.com/flavorjones/loofah/commit/5e91af861e3cdab47b91dd0b81f3afdfd13a5e19","tags":["x_refsource_MISC"],"url":"https://github.com/flavorjones/loofah/commit/5e91af861e3cdab47b91dd0b81f3afdfd13a5e19"},{"name":"https://github.com/flavorjones/loofah/releases/tag/v2.25.2","tags":["x_refsource_MISC"],"url":"https://github.com/flavorjones/loofah/releases/tag/v2.25.2"}],"affected":[{"vendor":"flavorjones","product":"loofah","versions":[{"version":">= 2.25.0, < 2.25.2","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-08-12T20:59:18.589Z"},"descriptions":[{"lang":"en","value":"Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. From 2.25.0 until 2.25.2, Loofah::HTML5::Scrub.allowed_uri? does not reject javascript: URIs whose scheme is split or prefixed with the HTML5 named whitespace character references &Tab; or &NewLine;. CGI.unescapeHTML leaves those references intact, so allowed_uri? reports the URL safe even though a browser decodes and strips the tab or line feed and executes the resulting javascript: URL. This issue affects only callers that pass HTML-encoded strings directly to allowed_uri?; Loofah's default sanitize() path is not affected. This issue is fixed in version 2.25.2."}],"source":{"advisory":"GHSA-8whx-365g-h9vv","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-13T13:49:09.263231Z","id":"CVE-2026-73491","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-13T13:49:22.724Z"}}]}}