CVE-2026-28227 LOW

CVE-2026-28227: Discourse Vulnerable to Unauthorized Topic Creation in Staff-Only Categories via Topic Timer publish_to_category

Vendor Discourse
Product discourse
Weakness CWE-863 · Incorrect authorization
Published February 26, 2026
Last update March 3, 2026
View on NVD All CVEs

CVSS base score

1.2/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction None
Confidentiality —
Integrity —

CVSS 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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

February 26, 2026 CVE published
March 3, 2026 Record updated