CVE-2026-28227 Details
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.
A vulnerability exists in Discourse versions prior to 2025.12.2, 2026.1.1, and 2026.2.0, allowing TL4 users to publish topics in staff-only categories. This is achieved through the 'publish_to_category' topic timer, which bypasses necessary authorization checks. The vulnerability arises from inadequate permission controls, enabling unauthorized access to restricted categories.
Users can upgrade to Discourse versions 2025.12.2, 2026.1.1, or 2026.2.0 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 3, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/discourse/discourse/security/advisories/GHSA-m49w-78mh-87jp | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-863 | Incorrect Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| discourse discourse | < 2025.12.2 >= 2026.1.0, < 2026.1.1 2026.2.0 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 2, 2026 | Initial Analysis | [email protected] |
| Feb 26, 2026 | New CVE Received | [email protected] |