Auth bypass in Discourse

CVE-2026-33427

Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, an unauthenticated attacker can cause a legitimate Discourse authorization page to display an attacker-controlled domain, facilit…

Vulnerability class: Broken Access Control

EPSS: 0.001 (31.2th percentile) — read the EPSS interpretation.

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-862 — Missing Authorization

References

https://github.com/discourse/discourse/security/advisories/GHSA-9vhg-2mx3-mqfr (x_refsource_CONFIRM)