CVE-2026-28227CWE-863

Discourse Vulnerable to Unauthorized Topic Creation in Staff-Only Categories via Topic Timer publish_to_category

Low · published February 26, 2026

CVSS v4.0
1.2
EPSS
0%
Percentile
23.0
In the wild
Unconfirmed
What it is

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, TL4 users can publish topics into staff-only categories via the `publish_to_category` topic timer, bypassing authorization checks. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.

The record
Technical detail
CVSS v4.0
1.2 · LOW
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
EPSS
0.00313 · 23.0th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2026-02-26T21:27Z
EPSS history
Timeline
  • 26 FEB 21:27Z
    Discourse Vulnerable to Unauthorized Topic Creation in Staff-Only Categories via Topic Timer publish_to_category
    cvelistv5