CVE-2026-33300

MEDIUM

Discourse: Hidden group names and access metadata are exposed to moderators through the `category-chatables` endpoint

Title source: cna
STIX 2.1

Description

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, an authorization bypass in the Category Chatables Controller show action allowed moderators to get information on hidden groups names and user count. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.

References (2)

Core 2

Scores

CVSS v3 6.5
EPSS 0.0023
EPSS Percentile 14.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-200
Status published
Products (5)
discourse/discourse 2026.3.0 (2 CPE variants)
discourse/discourse 2026.1.0 - 2026.1.3
discourse/discourse >= 2026.1.0-latest, < 2026.1.3
discourse/discourse >= 2026.2.0-latest, < 2026.2.2
discourse/discourse >= 2026.3.0-latest, < 2026.3.0
Published Mar 31, 2026
Tracked Since Mar 31, 2026