CVE-2026-33424

EUVD-2026-13904
Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 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-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.9 MEDIUM
ADJACENT_NETWORK
HIGH
HIGH
CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:L
GitHub_MCNA
5.9 MEDIUM
ADJACENT_NETWORK
HIGH
HIGH
CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Affected Products (NVD)
VendorProductVersion
discoursediscourse
2026.1.0 ≤
𝑥
< 2026.1.2
discoursediscourse
2026.2.0 ≤
𝑥
< 2026.2.1
discoursediscourse
2026.3.0
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/discourse/discourse/security/advisories/GHSA-hgcp-p7hq-cwxw