CVE-2026-33427

Discourse Authorization Page Displays Unvalidated Redirect Domain

State: Published
Severity: 2.7 Low
Published: Mar 20, 2026
Updated: Mar 23, 2026
Reserved: Mar 19, 2026

Description

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, facilitating social engineering attacks against users. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. No known workarounds are available.

Scores

CVSS	Score	Vector	Source
4.0	2.7 Low	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U	GitHub_M

Weaknesses

CWE-862 Missing Authorization

Affected Products

Product	Versions
discoursediscourse	>= 2026.1.0-latest, < 2026.1.2Affected >= 2026.2.0-latest, < 2026.2.1Affected = 2026.3.0-latestAffected

References

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

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