CVE-2026-73427: Trix: XSS via JSON deserialization bypass in drag-and-drop (Level0InputController)
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 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.
CWE-79
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
basecamp: trix
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- github.com/basecamp/trix/commit/9c0a993d9fc2ffe9d56b013b030bc238f9c0557c (opens in new tab)
- github.com/basecamp/trix/pull/1293 (opens in new tab)
- github.com/basecamp/trix/releases/tag/v2.1.18 (opens in new tab)
- github.com/basecamp/trix/security/advisories/GHSA-53p3-c7vp-4mcc (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)