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0.0
Discourse allows unauthorized access to private category management
CVE-2026-26979
Summary
Discourse users with a higher level of access can bypass access controls in private categories, potentially allowing them to close, archive, or pin sensitive topics. This issue has been patched in versions 2025.12.2, 2026.1.1, and 2026.2.0, so update your platform to the latest version. If you can't update immediately, consider restricting user access levels until you can patch your Discourse installation.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| discourse | discourse | <= 2025.12.0 | – |
| discourse | discourse | > 2026.1.0 , <= 2026.1.1 | – |
| discourse | discourse | 2026.2.0 | – |
Original title
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, TL4 users are able to close, archive and pin topics in private categories they don't have acces...
Original description
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, TL4 users are able to close, archive and pin topics in private categories they don't have access to. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.
nvd CVSS3.1
2.7
nvd CVSS4.0
0.0
Vulnerability type
CWE-862
Missing Authorization
Published: 26 Feb 2026 · Updated: 12 Mar 2026 · First seen: 6 Mar 2026