EUVD-2026-13724Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
6DescriptionCVE.org
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.
AnalysisAI
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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Vulnerability AssessmentAI
| Risk Assessment | The CVSS 3.1 score of 6.1 (Medium severity) reflects the moderate real-world risk profile: the attack vector is network-based (AV:N) with low complexity (AC:L), requires no privileges (PR:N), but does require user interaction (UI:R), and the scope is changed (S:C) with low confidentiality and integrity impacts (C:L/I:L) and no availability impact (A:N). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker creates a Textpattern post or page and sets the category parameter to a malicious Atom payload such as: category=test"><script>alert('XSS')</script><id>. When an administrator or feed consumer accesses the Atom feed endpoint and the feed is displayed in a web-based feed reader or admin dashboard that uses innerHTML to render feed content, the embedded JavaScript executes in the context of that dashboard with full access to the user's session cookies, credentials, and admin privileges. … |
| Remediation | Immediately update Textpattern CMS to the patched version released by the vendor (consult https://textpattern.com/ for the specific version number and release date). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 30 days: Identify affected systems running Textpattern CMS and apply vendor patches as part of regular patch cycle. …
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Vendor StatusVendor
Debian
| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| (unstable) | fixed | (unfixed) | - |
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