Trix has a Stored XSS vulnerability through serialized attributes
Date: 2026-03
Affected: npm/trix, rubygems/action_text-trix
Attack vector: xss
Category: vulnerability-disclosure
Severity: Medium
CWE: CWE-79
CVSS: 4.6 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N)

### Impact The Trix editor, in versions prior to 2.1.17, is vulnerable to XSS attacks when a `data-trix-serialized-attributes` attribute bypasses the DOMPurify sanitizer. An attacker could craft HTML containing a `data-trix-serialized-attributes` attribute with a malicious payload that, when the content is rendered, could execute arbitrary JavaScript code within the context of the user's session, potentially leading to unauthorized actions being performed or sensitive information being disclosed. ### Patches Update Recommendation: Users should upgrade to Trix editor version 2.1.17 or later. ### References The XSS vulnerability was responsibly reported by Hackerone researcher [newbiefromcoma](https://hackerone.com/newbiefromcoma).


Mitigations:

Architectural layers (MAESTRO):