PT-2026-25968 · Red Hat · Red Hat Build Of Keycloak 26.2+3

Published 2026-03-18 · Updated 2026-03-18 · CVE-2026-2603

Mitre

CVSS v3.1

8.1

8.1

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

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.

Fix

Missing Authentication

Weakness Enumeration

CWE-306

Related Identifiers

CVE-2026-2603

Affected Products

Red Hat Build Of Keycloak 26.2

Red Hat Build Of Keycloak 26.2.14

Red Hat Build Of Keycloak 26.4

Red Hat Build Of Keycloak 26.4.10

References · 7

• https://access.redhat.com/errata/RHSA-2026:3925 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-2603 · Security Note
• https://access.redhat.com/errata/RHSA-2026:3947 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:3926 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:3948 · Vendor Advisory
• https://access.redhat.com/security/cve/CVE-2026-2603 · Note
• https://bugzilla.redhat.com/show_bug.cgi?id=2440300 · Note