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Vulnerabilities CVE-2026-63670

CVE-2026-63670

Medium
Open
TLP:CLEAR

ApostropheCMS: Mutation-XSS / allowedTags bypass via literal `</textarea/>` solidus close

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Description

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.

Details

CVSS Score
6.1
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Confidence
90%
Published
Aug 17, 2026
Last Modified
Aug 17, 2026
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