Origin validation error in Keycloak - CVE-2026-16442
Published: August 6, 2026
Vulnerability identifier: #VU141171
CSH Severity: Medium
CVSS v4: 9.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-16442
CWE-ID: CWE-346
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information and modify data.
The vulnerability exists due to origin validation error in the SAML IdP-initiated broker login flow when processing IdP-initiated broker login requests. A remote attacker can send a specially crafted SAML IdP-initiated broker login request to disclose sensitive information and modify data.
Affected software
Keycloak
How to mitigate CVE-2026-16442
Install security update from vendor's website.
Keycloak - addressed in versions 26.4.14, 26.6.5, 26.7.1