{"id":"CVE-2026-73427","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-73427","summary":"Trix is vulnerable to XSS through JSON deserialization bypass in drag-and-drop (Level0InputController)","details":"### Impact\n\nThe 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).\n\nThe `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.\n\nExploitation 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.\n\n### Patches\n\nUpdate Recommendation: Users should upgrade to Trix editor version 2.1.18 or later.\n\n\n### References\n\nThe XSS vulnerability was responsibly reported by Hackerone researcher [newbiefromcoma](https://hackerone.com/newbiefromcoma).","published":"2026-03-29T15:22:17Z","modified":"2026-08-12T21:00:06.950867224Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"trix","fixedVersion":"2.1.18"},{"ecosystem":"RubyGems","name":"action_text-trix","fixedVersion":"2.1.18"}],"fix":{"url":"https://github.com/basecamp/trix/commit/9c0a993d9fc2ffe9d56b013b030bc238f9c0557c","label":"basecamp/trix@9c0a993"},"references":[{"type":"WEB","url":"https://github.com/basecamp/trix/security/advisories/GHSA-53p3-c7vp-4mcc"},{"type":"WEB","url":"https://github.com/basecamp/trix/commit/9c0a993d9fc2ffe9d56b013b030bc238f9c0557c"},{"type":"PACKAGE","url":"https://github.com/basecamp/trix"},{"type":"WEB","url":"https://github.com/basecamp/trix/releases/tag/v2.1.18"},{"type":"WEB","url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/action_text-trix/GHSA-53p3-c7vp-4mcc.yml"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T21:00:06.950867224Z"}}