Cross-site scripting in Trix - CVE-2025-21610
Published: January 3, 2025 / Updated: April 28, 2026
Vulnerability identifier: #VU128359
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green
CVE-ID: CVE-2025-21610
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 attacker to execute arbitrary JavaScript code in the user's session.
The vulnerability exists due to cross-site scripting in the link field when processing a pasted javascript: URL. A remote attacker can trick the user into copy-pasting a malicious link to execute arbitrary JavaScript code in the user's session.
User interaction is required to paste the crafted link.
How to mitigate CVE-2025-21610
Install security update from vendor's website.