CVE-2026-33355
Discourse filters whisper posts from private-posts feed
6.5
MEDIUM
CVSS 3.1
EPSS 0.02%
Description
Discourse is an open-source discussion platform. Prior to versions 2026.3.0, 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, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.
How to fix CVE-2026-33355
To remediate CVE-2026-33355, upgrade the affected package to a fixed version below.
- —upgrade to 2026.1.2 or later
Is CVE-2026-33355 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 2026.1.0, < 2026.1.2, >= 2026.2.0, < 2026.2.1, >= 2026.3.0, < 2026.3.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
References (5)
- WEBgithub.com/discourse/discourse/commit/84e5865a279716c6866e8c0648d1d8b42320603c
- WEBgithub.com/discourse/discourse/commit/d25b8ee9ee182dbb34e92b34e39878ce4d59bcdc
- WEBgithub.com/discourse/discourse/commit/d2f317271ad7638f1e2791905472ebd9370946d1
- WEBgithub.com/discourse/discourse/security/advisories/GHSA-g4v5-6gfp-3hjq