Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in Discourse - CVE-2026-32273
Published: July 1, 2026
Vulnerability identifier: #VU136166
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-32273
CWE-ID: CWE-80
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 script in a victim's browser.
The vulnerability exists due to improper neutralization of script-related html tags in category description update handling via API when processing a user-supplied description string. A remote user can submit a crafted category description via the API to execute arbitrary script in a victim's browser.
User interaction is required for the crafted content to be viewed.
How to mitigate CVE-2026-32273
Install security update from vendor's website.