CVE-2026-28219CWE-915

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

Low · published February 26, 2026

CVSS v4.0
1.3
EPSS
0%
Percentile
29.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
1.3 · LOW
Vector
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
EPSS
0.00367 · 29.4th percentile
Weakness
CWE-915 · Improperly Controlled Modification of Dynamically-Determined Object Attributes
Published
2026-02-26T21:25Z
EPSS history
Timeline
  • 26 FEB 21:25Z
    Privilege Escalation via Mass Assignment Allows Regular Users to Set Topics as Global Banners
    cvelistv5