EUVD-2026-13724CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
5Tags
Description
A Second-Order Cross-Site Scripting (XSS) vulnerability exists in Textpattern CMS version 4.9.0 due to improper sanitization and contextual encoding of user-supplied input embedded within Atom feed XML elements. User-controlled parameters (e.g., category) are reflected into Atom fields such as <id> and <link href> without proper XML escaping. While the payload may not execute directly in modern browsers in raw XML context, it can execute when the feed is consumed by HTML-based feed readers, admin dashboards, or CMS aggregators that insert the feed content into the DOM using unsafe methods (e.g., innerHTML), resulting in JavaScript execution in a trusted context.
Analysis
A second-order XSS vulnerability exists in Textpattern CMS version 4.9.0 where user-supplied input (such as category parameters) is improperly sanitized and lacks contextual XML escaping in Atom feed XML elements like <id> and <link href>. While the payload does not execute directly in raw XML contexts within modern browsers, it becomes exploitable when feed readers, admin dashboards, or CMS aggregators consume the feed and insert its content into the DOM using unsafe methods like innerHTML, resulting in arbitrary JavaScript execution in a trusted context. …
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Remediation
Within 30 days: Identify affected systems running Textpattern CMS and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.
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Priority Score
Vendor Status
Debian
| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| (unstable) | fixed | (unfixed) | - |
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External POC / Exploit Code
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