Input validation error in Discourse - CVE-2023-36818
Published: July 11, 2023 / Updated: July 1, 2026
Vulnerability identifier: #VU136087
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2023-36818
CWE-ID: CWE-20
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 input validation in custom sidebar section creation or update handling when processing requests to create or update custom sidebar sections. A remote user can send a specially crafted request with unlimited link creation to cause a denial of service.
How to mitigate CVE-2023-36818
Install security update from vendor's website.