CVE-2026-33355
MEDIUM severity · CVSS 6.5 · Information disclosure
6.5CVSS MEDIUM
Summary
Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, the `/private-posts` endpoint did not apply post-type visibility filtering, allowing regular PM participants to see whisper posts in PM topics they had access to. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
Confidentiality impactHigh
Integrity impactNone
Availability impactNone
Exploit probability (EPSS)0%
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Affected products we track (1)
Recommendation
Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.
Official patch: https://github.com/discourse/discourse/commit/84e5865a279716c6866e8c0648d1d8b42320603c ↗
Additional information
- NVD record
- https://github.com/discourse/discourse/commit/84e5865a279716c6866e8c0648d1d8b42320603cPatch
- https://github.com/discourse/discourse/commit/d25b8ee9ee182dbb34e92b34e39878ce4d59bcdcPatch
- https://github.com/discourse/discourse/commit/d2f317271ad7638f1e2791905472ebd9370946d1Patch
- https://github.com/discourse/discourse/security/advisories/GHSA-g4v5-6gfp-3hjqAdvisory