CVE-2026-33300CWE-200

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

Medium · published March 31, 2026

CVSS v4.0
5.3
EPSS
0%
Percentile
32.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
5.3 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
EPSS
0.00397 · 32.8th percentile
Weakness
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
Published
2026-03-31T17:42Z
EPSS history
Timeline
  • 31 MAR 17:42Z
    Discourse: Hidden group names and access metadata are exposed to moderators through the `category-chatables` endpoint
    cvelistv5