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Vulnerability Intelligence

CVE-2026-28227 | Mondoo Vulnerability Intelligence

Vulnerability IntelligenceCVE-2026-28227

CVE-2026-28227

LOW1.2

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

Published Feb 26, 2026

Modified Yesterday

Details

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.

References

https://github.com/discourse/discourse/security/advisories/GHSA-m49w-78mh-87jp

https://www.cve.org/CVERecord?id=CVE-2026-28227

CVSS Analysis

CVSS v4.0

1.2

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Attack Requirements

NoneAT:N

Privileges Required

HighPR:H

User Interaction

NoneUI:N

Vulnerable System

Vuln. Confidentiality

NoneVC:N

Vuln. Integrity

LowVI:L

Vuln. Availability

NoneVA:N

Subsequent System

Subseq. Confidentiality

NoneSC:N

Subseq. Integrity

NoneSI:N

Subseq. Availability

NoneSA:N

1.2/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

Weakness Type (CWE)

Access Control

Incorrect Authorization

Ecosystems

Timeline

PublishedFeb 26, 2026

ModifiedMar 3, 2026