CVE-2026-32986
Received Received - Intake
Second-Order XSS in Textpattern CMS Atom Feed Enables Script Execution

Publication date: 2026-03-20

Last updated on: 2026-04-16

Assigner: VulnCheck

Description
Textpattern CMS version 4.9.0 contains a second-order cross-site scripting vulnerability that allows attackers to inject malicious scripts by exploiting improper sanitization of user-supplied input in Atom feed XML elements. Attackers can embed unescaped payloads in parameters such as category that are reflected into Atom fields like and , which execute as JavaScript when feed readers or CMS aggregators consume the feed and insert content into the DOM using unsafe methods.
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Meta Information
Published
2026-03-20
Last Modified
2026-04-16
Generated
2026-06-16
AI Q&A
2026-03-20
EPSS Evaluated
2026-06-15
NVD
CVE-2026-32986
EUVD
EUVD-2026-13724
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
textpattern textpattern 4.9.0
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CWE-116 The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.
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Executive Summary

This vulnerability is a Second-Order Cross-Site Scripting (XSS) issue found in Textpattern CMS version 4.9.0. It occurs because user-supplied input, such as the category parameter, is embedded into Atom feed XML elements like <id> and <link href> without proper XML escaping or sanitization.

Although the malicious payload may not execute directly in modern browsers when viewing the raw XML feed, 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 like innerHTML. This leads to JavaScript execution in a trusted context.

Impact Analysis

This vulnerability can allow an attacker to execute arbitrary JavaScript code in the context of trusted applications that consume the vulnerable Atom feed. This can lead to unauthorized actions such as stealing session tokens, performing actions on behalf of the user, or manipulating the content displayed in admin dashboards or feed readers.

Compliance Impact

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Detection Guidance

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