Vulnerability Details CVE-2026-2603
A flaw was found in Keycloak. A remote attacker could bypass security controls by sending a valid SAML response from an external Identity Provider (IdP) to the Keycloak SAML endpoint for IdP-initiated broker logins. This allows the attacker to complete broker logins even when the SAML Identity Provider is disabled, leading to unauthorized authentication.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 34.5%
CVSS Severity
CVSS v3 Score 8.1
References
- https://access.redhat.com/errata/RHSA-2026:3925
- https://access.redhat.com/errata/RHSA-2026:3926
- https://access.redhat.com/errata/RHSA-2026:3947
- https://access.redhat.com/errata/RHSA-2026:3948
- https://access.redhat.com/security/cve/CVE-2026-2603
- https://bugzilla.redhat.com/show_bug.cgi?id=2440300
- https://access.redhat.com/errata/RHSA-2026:3925
- https://access.redhat.com/errata/RHSA-2026:3926
- https://access.redhat.com/errata/RHSA-2026:3947
- https://access.redhat.com/errata/RHSA-2026:3948
- https://access.redhat.com/security/cve/CVE-2026-2603
- https://bugzilla.redhat.com/show_bug.cgi?id=2440300
- https://bugzilla.redhat.com/show_bug.cgi?id=2440300
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2603.json
Products affected by CVE-2026-2603
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cpe:2.3:a:redhat:build_of_keycloak:26.2
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cpe:2.3:a:redhat:build_of_keycloak:26.2.10
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cpe:2.3:a:redhat:build_of_keycloak:26.2.11
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cpe:2.3:a:redhat:build_of_keycloak:26.2.12
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cpe:2.3:a:redhat:build_of_keycloak:26.2.13
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cpe:2.3:a:redhat:build_of_keycloak:26.2.5
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cpe:2.3:a:redhat:build_of_keycloak:26.2.6
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cpe:2.3:a:redhat:build_of_keycloak:26.2.7
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cpe:2.3:a:redhat:build_of_keycloak:26.2.8
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cpe:2.3:a:redhat:build_of_keycloak:26.2.9
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cpe:2.3:a:redhat:build_of_keycloak:26.4
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cpe:2.3:a:redhat:build_of_keycloak:26.4.4
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cpe:2.3:a:redhat:build_of_keycloak:26.4.5
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cpe:2.3:a:redhat:build_of_keycloak:26.4.6
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cpe:2.3:a:redhat:build_of_keycloak:26.4.7
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cpe:2.3:a:redhat:build_of_keycloak:26.4.8
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cpe:2.3:a:redhat:build_of_keycloak:26.4.9