Cross-site scripting in Discourse - CVE-2023-25172
Published: March 17, 2023 / Updated: July 1, 2026
Vulnerability identifier: #VU136081
CSH Severity: Low
CVSS v4: 2.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2023-25172
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary script in a victim's browser.
The vulnerability exists due to cross-site scripting in the full name field when displaying a maliciously crafted URL in a user's name on a post. A remote user can set a crafted full name value to execute arbitrary script in a victim's browser.
Exploitation requires a site with disabled or overly permissive content security policy settings.
Affected software
Discourse
How to mitigate CVE-2023-25172
Install security update from vendor's website.
Discourse - addressed in versions 3.0.1, 3.1.0 beta2