CVE-2026-63670
CVE-2026-63670 · ApostropheCMS: Mutation-XSS / allowedTags bypass via literal `</textarea/>` solidus close
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 6.1 · Medium · EPSS 0.3% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
apostrophe
- Versions
- < 2.17.6: Affected
No fix published
sanitize-html npm
- Affected ranges
- SEMVER: < 2.17.6
Update to 2.17.6