{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63670","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-07-17T14:47:08.032Z","datePublished":"2026-08-17T19:49:51.903Z","dateUpdated":"2026-08-18T18:08:30.331Z"},"containers":{"cna":{"title":"ApostropheCMS: Mutation-XSS / allowedTags bypass via literal `</textarea/>` solidus close","problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-jxwj-j7wr-gfrw","tags":["x_refsource_CONFIRM"],"url":"https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-jxwj-j7wr-gfrw"},{"name":"https://github.com/apostrophecms/apostrophe/pull/5501","tags":["x_refsource_MISC"],"url":"https://github.com/apostrophecms/apostrophe/pull/5501"},{"name":"https://github.com/apostrophecms/apostrophe/commit/eae1fb2b72ec5d1c27d0977509c6482a0408f725","tags":["x_refsource_MISC"],"url":"https://github.com/apostrophecms/apostrophe/commit/eae1fb2b72ec5d1c27d0977509c6482a0408f725"}],"affected":[{"vendor":"apostrophecms","product":"apostrophe","versions":[{"version":"< 2.17.6","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-08-17T19:49:51.903Z"},"descriptions":[{"lang":"en","value":"ApostropheCMS is an open-source Node.js content management system. Prior to 2.17.6, sanitizeHtml() can pass disallowed executable markup through packages/sanitize-html/index.js when textarea or xmp is included in allowedTags because a literal solidus after the raw-text end-tag name is treated as text by htmlparser2 and the ontext handler emits that content without escaping, while a browser parses the following img onerror markup as active HTML. This issue is fixed in version 2.17.6."}],"source":{"advisory":"GHSA-jxwj-j7wr-gfrw","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-jxwj-j7wr-gfrw","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-18T18:07:52.564054Z","id":"CVE-2026-63670","options":[{"Exploitation":"poc"},{"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":"2026-08-18T18:08:30.331Z"}}]}}