EUVD-2026-23104
GHSA-97v6-998m-fp4g
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
Lifecycle Timeline
6DescriptionGitHub Advisory
ApostropheCMS is an open-source Node.js content management system. Versions 4.28.0 and prior contain a stored cross-site scripting vulnerability in the @apostrophecms/color-field module, where color values prefixed with -- bypass TinyColor validation intended for CSS custom properties, and the launder.string() call performs only type coercion without stripping HTML metacharacters. These unsanitized values are then concatenated directly into <style> tags both in per-widget style elements rendered for all visitors and in the global stylesheet rendered for editors, with the output marked as safe HTML. An editor can inject a value which closes the style tag and executes arbitrary JavaScript in the browser of every visitor to any page containing the affected widget. This enables mass session hijacking, cookie theft, and privilege escalation to administrative control if an admin views draft content. This issue has been fixed in version 4.29.0.
AnalysisAI
Stored cross-site scripting in ApostropheCMS versions 4.28.0 and prior allows authenticated editors to inject arbitrary JavaScript into the color-field widget, executing in the browsers of all site visitors. Exploitation enables mass session hijacking and privilege escalation to administrative control; publicly available proof-of-concept exploit code exists, though no active exploitation has been confirmed. The vulnerability has been patched in version 4.29.0.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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