What is CVE-2026-33410?

CVE-2026-33410 is a medium-severity vulnerability in Discourse, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-03-19.

How severe is CVE-2026-33410?

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

Auth bypass in Discourse

CVE-2026-33410

Discourse is an open-source discussion platform. Versions prior to 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 have two authorization issues in the chat direct message API. First, when creating a direct message channel or adding users to an…

Vulnerability class: Broken Access Control

EPSS: 0.001 (16.3th 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-2m5j-6v2r-cq2h (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-33410?: CVE-2026-33410 is a medium-severity vulnerability in Discourse, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-03-19.
How severe is CVE-2026-33410?: Medium severity. CVSS v3 base score is 5.4 out of 10.