Vulnerability Description
Trix is a what-you-see-is-what-you-get rich text editor for everyday writing. Prior to 2.1.18, Trix is vulnerable to stored cross-site scripting when crafted HTML is pasted into the editor. HTMLParser processes a mock attachment in a `<span>` with an empty `data-trix-attachment="{}"` value, causing data-trix-attributes to be applied to a plain string piece. StringPiece.fromJSON accepts an unvalidated href, allowing a javascript: URI to enter the document model and serialized HTML and execute when another user renders and clicks the content. Applications that apply server-side HTML sanitization can neutralize the payload on save. This issue is fixed in version 2.1.18.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/basecamp/trix/commit/9c0a993d9fc2ffe9d56b013b030bc238f9c0557c
- https://github.com/basecamp/trix/pull/1293
- https://github.com/basecamp/trix/releases/tag/v2.1.18
- https://github.com/basecamp/trix/security/advisories/GHSA-53g2-mvcc-q9x3
FAQ
What is CVE-2026-73428?
CVE-2026-73428 is a vulnerability with a CVSS score of 4.6 (MEDIUM). Trix is a what-you-see-is-what-you-get rich text editor for everyday writing. Prior to 2.1.18, Trix is vulnerable to stored cross-site scripting when crafted HTML is pasted into the editor. HTMLParser...
How severe is CVE-2026-73428?
CVE-2026-73428 has been rated MEDIUM with a CVSS base score of 4.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-73428?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.