PT-2026-26709 · Discourse · Discourse

Published 2026-03-20 · Updated 2026-03-21 · CVE-2026-33425

Mitre

CVSS v4.0

6.9

Medium

AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Discourse is an open-source discussion platform. Prior to versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2, unauthenticated users can determine whether a specific user is a member of a private group by observing changes in directory results when using the exclude groups parameter. Versions 2026.3.0-latest.1, 2026.2.1, and 2026.1.2 contain a patch. As a workaround, disable public access to the user directory via Admin → Settings → hide user profiles from public.

Fix

Missing Authorization

Side Channel Attack

IDOR

Weakness Enumeration

CWE-862

CWE-203

CWE-639

Related Identifiers

CVE-2026-33425

Affected Products

Discourse

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-33425 · Security Note
• https://github.com/discourse/discourse/security/advisories/GHSA-r6rh-xvf5-r5f2 · Note