CVE-2026-28219

Privilege Escalation via Mass Assignment Allows Regular Users to Set Topics as Global Banners

State: Published
Severity: 1.3 Low
Published: Feb 26, 2026
Updated: Mar 3, 2026
Reserved: Feb 25, 2026

Description

Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, an improper authorization check in the topic management logic allows authenticated users to modify privileged attributes of their topics. By manipulating specific parameters in a PUT or POST request, a regular user can elevate a topic’s status to a site-wide notice or banner, bypassing intended administrative restrictions. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. There are no practical workarounds to prevent this behavior other than applying the security patch. Administrators concerned about unauthorized promotions should audit recent changes to site banners and global notices until the fix is deployed.

Scores

CVSS	Score	Vector	Source
4.0	1.3 Low	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U	GitHub_M

Weaknesses

CWE-915 Improperly Controlled Modification of Dynamically-Determined Object Attributes

Affected Products

Product	Versions
discoursediscourse	< 2025.12.2Affected >= 2026.1.0-latest, < 2026.1.1Affected >= 2026.2.0-latest, < 2026.2.0Affected

References

https://github.com/discourse/discourse/security/advisories/GHSA-8v26-9f7h-jc8x

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