Cross-site scripting in Discourse - CVE-2026-32607
Published: July 1, 2026
Vulnerability identifier: #VU136153
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-32607
CWE-ID: CWE-79
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 execute arbitrary JavaScript in the browser of a user viewing an affected topic.
The vulnerability exists due to cross-site scripting in assignment-related UI rendering paths when rendering unescaped user or group display names. A remote user can set a crafted assignee name to execute arbitrary JavaScript in the browser of a user viewing an affected topic.
Only sites with the assign plugin enabled and the hidden prioritize_full_name_in_ux site setting manually enabled via console are vulnerable.
How to mitigate CVE-2026-32607
Install security update from vendor's website.