Improper access control in Discourse - CVE-2026-27935
Published: July 1, 2026
Vulnerability identifier: #VU136161
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-27935
CWE-ID: CWE-284
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 disclose sensitive information.
The vulnerability exists due to improper access control in an API endpoint when handling requests for private topic metadata. A remote user can send a request to disclose sensitive information.
The issue exposes private topic metadata of admin users to moderator users who do not have access to the private topics.
How to mitigate CVE-2026-27935
Install security update from vendor's website.