What is CVE-2026-33424?

CVE-2026-33424 is a medium-severity vulnerability in Discourse, classified under Incorrect Authorization. CVSS score: 5.9/10. Published 2026-03-20.

How severe is CVE-2026-33424?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Auth bypass in Discourse

CVE-2026-33424

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…

Vulnerability class: Broken Access Control

EPSS: 0.000 (3.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:L.

Affected products

Discourse — versions >= 2026.1.0-latest, < 2026.1.2, >= 2026.2.0-latest, < 2026.2.1, = 2026.3.0-latest

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

https://github.com/discourse/discourse/security/advisories/GHSA-hgcp-p7hq-cwxw (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-33424?: CVE-2026-33424 is a medium-severity vulnerability in Discourse, classified under Incorrect Authorization. CVSS score: 5.9/10. Published 2026-03-20.
How severe is CVE-2026-33424?: Medium severity. CVSS v3 base score is 5.9 out of 10.