Low 2.1Published Aug 12, 2026

CVE-2026-73427Trix: XSS via JSON deserialization bypass in drag-and-drop (Level0InputController)

Updated under an hour ago (2026-10-19 08:23 UTC)

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It affects basecamp trix. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for basecamp trix

Exploited in the last 30 days

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.

CVSS: 2.1 LOW (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Aug 13, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

basecamp trix basecamp:trix (from the name)	before 2.1.18	CNA record

References

https://github.com/basecamp/trix/security/advisories/GHSA-53p3-c7vp-4mccx-refsource-confirm
https://github.com/basecamp/trix/pull/1293x-refsource-misc
https://github.com/basecamp/trix/commit/9c0a993d9fc2ffe9d56b013b030bc238f9c0557cx-refsource-misc
https://github.com/basecamp/trix/releases/tag/v2.1.18x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.