CVE-2026-73427
Trix is vulnerable to XSS through JSON deserialization bypass in drag-and-drop (Level0InputController)
Impact
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 cross-site scripting when a crafted application/x-trix-document JSON payload is dropped into an editor using the fallback Level0InputController, such as an embedded WebView without Input Events Level 2 support. The StringPiece.fromJSON method trusts href attributes from the JSON payload without sanitization, allowing a draggable element containing a javascript: URI to bypass DOMPurify sanitization and inject executable JavaScript into the DOM. Exploitation requires the victim to drag and drop attacker-controlled content, and server-side HTML sanitization can neutralize the payload on save. This issue is fixed in version 2.1.18.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | trix | < 2.1.18 | 2.1.18 |
| rubygems | action_text-trix | < 2.1.18 | 2.1.18 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-53p3-c7vp-4mcc
- https://github.com/basecamp/trix/security/advisories/GHSA-53p3-c7vp-4mcc
- https://github.com/basecamp/trix/commit/9c0a993d9fc2ffe9d56b013b030bc238f9c0557c
- https://github.com/basecamp/trix/releases/tag/v2.1.18
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/action_text-trix/GHSA-53p3-c7vp-4mcc.yml
- https://github.com/basecamp/trix/pull/1293