Trix allows Cross-site Scripting via `javascript:` url in a link
The Trix editor, versions prior to 2.1.11, is vulnerable to XSS when pasting malicious code in the link field.
Impact
An attacker could trick the user to copy&paste a malicious javascript: URL as a link that would execute arbitrary JavaScript code within the context of the user's session, potentially leading to unauthorized actions being performed or sensitive information being disclosed.
See https://gist.github.com/th4s1s/3921fd9c3e324ad9a3e0d846166e3eb8
Patches
Update Recommendation: Users should upgrade to Trix editor version 2.1.12 or later.
Workarounds
This is not really a workaround but something that should be considered in addition to upgrading to the patched version. If affected users can disallow browsers that don't support a Content Security Policy, then this would be an effective workaround for this and all XSS vulnerabilities. Set CSP policies such as script-src 'self' to ensure that only scripts hosted on the same origin are executed, and explicitly prohibit inline scripts using script-src-elem.
References
https://gist.github.com/th4s1s/3921fd9c3e324ad9a3e0d846166e3eb8
Credits
This vulnerability was reported by Hackerone researcher https://hackerone.com/lio346?type=user
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | trix | < 2.1.12 | 2.1.12 |
References
- https://github.com/basecamp/trix/security/advisories/GHSA-j386-3444-qgwg
- https://nvd.nist.gov/vuln/detail/CVE-2025-21610
- https://github.com/basecamp/trix/commit/180c8d337f18e1569cea6ef29b4d03ffff5b5faa
- https://github.com/basecamp/trix/commit/c4f0d6f80654603932af6685694f694e96593b93
- https://gist.github.com/th4s1s/3921fd9c3e324ad9a3e0d846166e3eb8
- https://github.com/basecamp/trix
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N- Weakness (CWE)
CWE-79- Platform
- npm
- Package
trix- Disclosed
- 03.01.2025
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-j386-3444-qgwg - CC BY 4.0
Vulnerability history: trix
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 9
- First → latest
- 05.2024 07.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Medium 7
- Low 2
Disclosures per year
- 2024: 3
- 2025: 3
- 2026: 3
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Trix allows Cross-site Scripting via `javascript:` url in a link this entry
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