CVE-2026-28227 | THREATINT

Description

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.

PUBLISHED Reserved 2026-02-25 | Published 2026-02-26 | Updated 2026-02-26 | Assigner GitHub_M

LOW: 1.2CVSS: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

Problem types

CWE-863: Incorrect Authorization

Product status

< 2025.12.2

affected

>= 2026.1.0-latest, < 2026.1.1

affected

>= 2026.2.0-latest, < 2026.2.0

affected

References

github.com/...course/security/advisories/GHSA-m49w-78mh-87jp

cve.org (CVE-2026-28227)

nvd.nist.gov (CVE-2026-28227)

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