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The moment the application uses that template the way templates are meant to be used (cloning it and inserting the result into the page), the malicious payload comes along and runs as if it had never been sanitized. From there an attacker gets everything XSS normally gets them: session cookies, stored tokens, the ability to act as the user, and the ability to leave persistent payloads behind for the next person who visits.\n\n[advisory.pdf](https://github.com/user-attachments/files/28275600/advisory.pdf)\n\n[poc.html](https://github.com/user-attachments/files/28275708/poc.html)","state":0,"publishedAt":"2026-06-15T20:01:45+00:00","modifiedAt":"2026-09-10T03:50:50.4415751+00:00","affected":[{"ecosystem":"npm","name":"dompurify","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"3.4.7"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/cure53/DOMPurify/security/advisories/GHSA-rp9w-3fw7-7cwq","https://github.com/cure53/DOMPurify"],"sourceUrl":"https://github.com/advisories/GHSA-rp9w-3fw7-7cwq","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-rp9w-3fw7-7cwq","identifiers":["GHSA-rp9w-3fw7-7cwq","CVE-2026-49978"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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