Improper access control in Keycloak - CVE-2026-2603
Published: September 10, 2026
Vulnerability identifier: #VU148925
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-2603
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to authenticate users into the realm through a disabled SAML identity provider.
The vulnerability exists due to improper enforcement of disabled identity provider status in the SAML broker callback endpoint when processing IdP-initiated broker logins. A remote attacker can submit a SAML response through the broker callback endpoint to authenticate users into the realm through a disabled SAML identity provider.
Affected software
Keycloak
Red Hat build of Keycloak
Red Hat build of Keycloak
How to mitigate CVE-2026-2603
Install security update from vendor's website.
Keycloak - update to 26.5.5
Red Hat build of Keycloak - addressed in versions 26.2.14, 26.4.10
Red Hat build of Keycloak - addressed in versions 26.2.14, 26.4.10