Cross-site scripting in Trix - #VU128364
Published: April 28, 2026
Vulnerability identifier: #VU128364
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Basecamp
Affected software:
Trix
Trix
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary JavaScript code in the user's session.
The vulnerability exists due to cross-site scripting in the data-trix-serialized-attributes attribute handling when rendering crafted HTML content. A remote user can supply HTML containing a malicious data-trix-serialized-attributes attribute to execute arbitrary JavaScript code in the user's session.
User interaction is required when the content is rendered.
Remediation
Install security update from vendor's website.