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CVE-2026-33355 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/discourse/discourse/commit/84e5865a279716c6866e8c0648d1d8b42320603c	[email protected]	Patch
https://github.com/discourse/discourse/commit/d25b8ee9ee182dbb34e92b34e39878ce4d59bcdc	[email protected]	Patch
https://github.com/discourse/discourse/commit/d2f317271ad7638f1e2791905472ebd9370946d1	[email protected]	Patch
https://github.com/discourse/discourse/security/advisories/GHSA-g4v5-6gfp-3hjq	[email protected]	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-200	Exposure of Sensitive Information to an Unauthorized Actor	[email protected]

Affected Products

Product	Versions
discourse discourse	>= 2026.1.0, < 2026.1.2 >= 2026.2.0, < 2026.2.1 2026.3.0
CPE cpe:2.3:a:discourse:discourse:::::::: cpe:2.3:a:discourse:discourse:2026.3.0::::latest::: Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Mar 24, 2026	Initial Analysis	[email protected]
Mar 19, 2026	New CVE Received	[email protected]