Cross-site scripting in Keycloak - CVE-2026-37980
Published: September 10, 2026
Vulnerability identifier: #VU148945
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-37980
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 JavaScript in a user\'s browser.
The vulnerability exists due to improper neutralization of input during web page generation in the organization selection login page when rendering an organization alias in an inline JavaScript onclick handler. A remote privileged user can create an organization alias containing a crafted JavaScript payload to execute arbitrary JavaScript in a user\'s browser.
User interaction is required to view the login page.
Affected software
Keycloak
How to mitigate CVE-2026-37980
Install security update from vendor's website.
Keycloak - addressed in versions 26.5.6, 26.6.2