Improper access control in Discourse - CVE-2023-30606
Published: April 18, 2023 / Updated: July 1, 2026
Vulnerability identifier: #VU136500
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2023-30606
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 cause a denial of service.
The vulnerability exists due to improper access control in the SiteSetting class when handling unsanitized dynamic dispatch. A remote privileged user can call arbitrary methods such as clear_cache! or notify_changed! to cause a denial of service.
On multisite deployments, exploitation can affect the entire cluster. User interaction is required.
How to mitigate CVE-2023-30606
Install security update from vendor's website.