Improperly Controlled Modification of Dynamically-Determined Object Attributes in Discourse - CVE-2026-28219
Published: July 1, 2026
Vulnerability identifier: #VU136498
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-28219
CWE-ID: CWE-915
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Civilized Discourse Construction Kit, Inc.
Affected software:
Discourse
Discourse
Detailed vulnerability description
The vulnerability allows a remote user to modify privileged topic attributes.
The vulnerability exists due to improperly controlled modification of dynamically-determined object attributes in the topic management logic when handling crafted PUT or POST requests. A remote user can manipulate specific parameters to modify privileged topic attributes.
This can allow a regular authenticated user to set a topic as a site-wide notice or banner, bypassing intended administrative restrictions.
How to mitigate CVE-2026-28219
Install security update from vendor's website.