Improper Authorization in Discourse Discussion Platform
CVE-2026-28219

1.3LOW

Key Information:

Vendor

Discourse
Status
Discourse
Vendor
CVE Published:
26 February 2026

What is CVE-2026-28219?

Discourse, an open-source discussion platform, suffers from a vulnerability in its topic management functionality that allows authenticated users to manipulate specific parameters in PUT or POST requests. This exploitation can lead to unauthorized modifications of privileged topic attributes, including the elevation of topics to site-wide notices or banners, circumventing the platform's intended administrative controls. Administrators are encouraged to review recent changes to banners and notices in their systems, as there are no practical workarounds apart from implementing the necessary security patches available in versions 2025.12.2, 2026.1.1, and 2026.2.0.

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Deploy the Patch

Affected Version(s)

discourse < 2025.12.2 < 2025.12.2

discourse >= 2026.1.0-latest, < 2026.1.1 < 2026.1.0-latest, 2026.1.1

discourse >= 2026.2.0-latest, < 2026.2.0 < 2026.2.0-latest, 2026.2.0

References

https://github.com/discourse/discourse/security/advisorie...
x_refsource_CONFIRM

CVSS V4

Score:
1.3
Severity:
LOW
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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