What is CVE-2026-33251?

CVE-2026-33251 is a medium-severity vulnerability in Discourse, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-03-20.

How severe is CVE-2026-33251?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Auth bypass in Discourse

CVE-2026-33251

Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, an authorization bypass vulnerability in hidden Solved topics may allow unauthorized users to accept or unaccept solutions. Versi…

Vulnerability class: Broken Access Control

EPSS: 0.001 (18.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.

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-vm2x-9h8x-7jxm (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-33251?: CVE-2026-33251 is a medium-severity vulnerability in Discourse, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-03-20.
How severe is CVE-2026-33251?: Medium severity. CVSS v3 base score is 5.4 out of 10.