Is CVE-2026-63670 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-63670?

CVE-2026-63670 has a CVSS v3 severity of MEDIUM (6.1).

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CVE-2026-63670

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.