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The Trix editor, in versions prior to 2.1.18, is vulnerable to XSS when a crafted application/x-trix-document JSON payload is dropped into the editor in environments using the fallback Level0InputController (e.g., embedded WebViews lacking Input Events Level 2 support).
The StringPiece.fromJSON method trusted href attributes from the JSON payload without sanitization. An attacker could craft a draggable element containing a javascript: URI in the href attribute that, when dropped into a vulnerable editor, would bypass DOMPurify sanitization and inject executable JavaScript into the DOM.
Exploitation requires a specific environment (Level0InputController fallback) and social engineering (victim must drag and drop attacker-controlled content into the editor). Applications using server-side HTML sanitization (such as Rails' built-in sanitizer) are additionally protected, as the payload is neutralized on save.
Update Recommendation: Users should upgrade to Trix editor version 2.1.18 or later.
The XSS vulnerability was responsibly reported by Hackerone researcher newbiefromcoma.
The Trix editor, in versions prior to 2.1.18, is vulnerable to XSS when a crafted application/x-trix-document JSON payload is dropped into the editor in environments using the fallback Level0InputController (e.g., embedded WebViews lacking Input Events Level 2 support).
The StringPiece.fromJSON method trusted href attributes from the JSON payload without sanitization. An attacker could craft a draggable element containing a javascript: URI in the href attribute that, when dropped into a vulnerable editor, would bypass DOMPurify sanitization and inject executable JavaScript into the DOM.
Exploitation requires a specific environment (Level0InputController fallback) and social engineering (victim must drag and drop attacker-controlled content into the editor). Applications using server-side HTML sanitization (such as Rails' built-in sanitizer) are additionally protected, as the payload is neutralized on save.
Update Recommendation: Users should upgrade to Trix editor version 2.1.18 or later.
The XSS vulnerability was responsibly reported by Hackerone researcher newbiefromcoma.
This low-severity vulnerability has limited impact but should still be addressed as part of regular security maintenance.
Apply security patches to version 2.1.18 immediately
Isolate affected systems from untrusted networks until patching is complete
Implement enhanced monitoring for exploitation attempts and unusual behavior