EUVD-2026-23106
GHSA-855c-r2vq-c292
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/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 SEO-related fields (SEO Title and Meta Description), where user-controlled input is rendered without proper output encoding into HTML contexts including <title> tags, <meta> attributes, and JSON-LD structured data. An attacker can inject a payload such as "></title><script>alert(1)</script> to break out of the intended HTML context and execute arbitrary JavaScript in the browser of any authenticated user who views the affected page. This can be leveraged to perform authenticated API requests, access sensitive data such as usernames, email addresses, and roles via internal APIs, and exfiltrate it to an attacker-controlled server. This issue has been fixed in version 4.29.0.
AnalysisAI
Stored cross-site scripting in ApostropheCMS SEO fields permits an authenticated attacker to inject arbitrary JavaScript that executes in the context of any authenticated user viewing the crafted page. This can be leveraged to exfiltrate sensitive user data (usernames, emails, roles) and perform actions as the victim via internal APIs. Public exploit code exists, but no active exploitation has been reported; a patch is available.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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