Vulnerability Description
Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, a topic "featured link" was not sufficiently normalized and escaped before being rendered in the topic list, allowing a user who can set a featured link to inject JavaScript when default Content Security Policy protections were modified or disabled. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Discourse | Discourse | >= 2026.1.0, < 2026.1.5 |
Related Weaknesses (CWE)
References
- https://github.com/discourse/discourse/commit/1bce8881e4253d9bbab56f011a12ef899bPatch
- https://github.com/discourse/discourse/commit/6679d9a5083488bae10c2adbb345c481c5Patch
- https://github.com/discourse/discourse/commit/6828aee9b15c2655d63b515ac919830bd5Patch
- https://github.com/discourse/discourse/commit/c9b9405f5bd0bf0269e505e28e3aad388dPatch
- https://github.com/discourse/discourse/releases/tag/v2026.1.5Release Notes
- https://github.com/discourse/discourse/releases/tag/v2026.4.2Release Notes
- https://github.com/discourse/discourse/releases/tag/v2026.5.1Release Notes
- https://github.com/discourse/discourse/releases/tag/v2026.6.0Release Notes
- https://github.com/discourse/discourse/security/advisories/GHSA-695w-7fv8-mxg3Vendor Advisory
FAQ
What is CVE-2026-55424?
CVE-2026-55424 is a vulnerability with a CVSS score of 5.4 (MEDIUM). Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, a topic "featured link" was not sufficiently normalized and escaped before being rendered in the t...
How severe is CVE-2026-55424?
CVE-2026-55424 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-55424?
Check the references section above for vendor advisories and patch information. Affected products include: Discourse Discourse.