CVE-2026-63670 — ApostropheCMS: Mutation-XSS / allowedTags bypass via literal `</textarea/>` solidus close
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 …
Published: 2026-08-17 · CVSS: 6.1 · CVSS 3.1
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: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7