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 malicious second factor name on an attacker-controlled account was not escaped in the delete confirmation dialog, allowing stored cross-site scripting when an administrator impersonated that account. This issue is fixed in versions 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Discourse | Discourse | >= 2026.1.0, < 2026.1.5 |
Related Weaknesses (CWE)
References
- https://github.com/discourse/discourse/commit/40de62cddadc65c328a1028ab999f3fa94Patch
- https://github.com/discourse/discourse/commit/529e17d4d570a48972e7cf64720e5dd1fdPatch
- https://github.com/discourse/discourse/commit/d92973e51a46cf6dd20c71e6068e6769b6Patch
- https://github.com/discourse/discourse/commit/daea5214d833eacbdd3b1a78d99eb14e9cPatch
- 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-wg5x-7f23-m3r5MitigationVendor Advisory
FAQ
What is CVE-2026-53963?
CVE-2026-53963 is a vulnerability with a CVSS score of 7.3 (HIGH). Discourse is an open-source discussion platform. Prior to 2026.6.0, 2026.5.1, 2026.4.2, and 2026.1.5, a malicious second factor name on an attacker-controlled account was not escaped in the delete con...
How severe is CVE-2026-53963?
CVE-2026-53963 has been rated HIGH with a CVSS base score of 7.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-53963?
Check the references section above for vendor advisories and patch information. Affected products include: Discourse Discourse.