CVE-2026-2603
HIGHKeycloak: keycloak: unauthorized authentication via disabled saml identity provider
Title source: cnaDescription
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.
References (6)
Core 6
Core References
Vendor Advisory vendor-advisory
x_refsource_redhat
RHSA-2026:3925
https://access.redhat.com/errata/RHSA-2026:3925
Vendor Advisory vendor-advisory
x_refsource_redhat
RHSA-2026:3926
https://access.redhat.com/errata/RHSA-2026:3926
Vendor Advisory vendor-advisory
x_refsource_redhat
RHSA-2026:3947
https://access.redhat.com/errata/RHSA-2026:3947
Vendor Advisory vendor-advisory
x_refsource_redhat
RHSA-2026:3948
https://access.redhat.com/errata/RHSA-2026:3948
Vdb Entry, X_Refsource_Redhat vdb-entry
x_refsource_redhat
https://access.redhat.com/security/cve/CVE-2026-2603
Issue Tracking, X_Refsource_Redhat issue-tracking
x_refsource_redhat
RHBZ#2440300
https://bugzilla.redhat.com/show_bug.cgi?id=2440300
Scores
CVSS v3
8.1
EPSS
0.0040
EPSS Percentile
31.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
total
Details
CWE
CWE-306
Status
published
Products (8)
org.keycloak/keycloak-server-spi-private
0 - 26.5.5Maven
org.keycloak/keycloak-services
0 - 26.5.5Maven
Red Hat/Red Hat build of Keycloak 26.2
26.2-16
Red Hat/Red Hat build of Keycloak 26.2
26.2.14-1
Red Hat/Red Hat build of Keycloak 26.2.14
Red Hat/Red Hat build of Keycloak 26.4
26.4-12
Red Hat/Red Hat build of Keycloak 26.4
26.4.10-1
Red Hat/Red Hat build of Keycloak 26.4.10
Published
Mar 18, 2026
Tracked Since
Mar 18, 2026