🛡️ CVE-2026-33424 — discourse

🟡 CVSS 5.0 — Medium ✅ No Known Exploit CWE-863 OSV
5.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

PM access granted through invites after access revocation

Discourse is an open-source discussion platform. Prior to versions 2026.3.0, 2026.2.1, and 2026.1.2, an attacker can grant access to a private message topic through invites even after they lose access to that PM. Versions 2026.3.0, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.

How this vulnerability can be exploited

This issue can be reached from an adjacent network, attack complexity is high, an attacker needs administrative privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability low.

Weakness class

CVE-2026-33424 is classified as CWE-863: Incorrect Authorization. An authorisation check runs but reaches the wrong conclusion, permitting actions it should refuse.

Affected software

CVE-2026-33424 is recorded against 1 package.

  • discourse

Timeline and source

Published on 27 March 2026 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
nvd.nist.gov (Web)

Details

Severity MEDIUM
CVSS Score 5.0
CVSS Vector CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:L
CWE CWE-863
Public Exploit ✅ No
Source OSV
Published 2026-03-27
Updated 2026-08-12
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
discourse — —

Similar Threats

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