Input validation error in Discourse - CVE-2023-36466
Published: July 11, 2023 / Updated: July 1, 2026
Vulnerability identifier: #VU136083
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2023-36466
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to bypass topic title validation checks.
The vulnerability exists due to improper input validation in the topic editing functionality when changing a topic category. A remote user can modify a topic in a way that skips title validation checks to bypass topic title validation checks.
User interaction is required to edit the topic.
Affected software
Discourse
How to mitigate CVE-2023-36466
Install security update from vendor's website.
Discourse - addressed in versions 3.0.5, 3.1.0 beta6