CVEvulnerability
CVE-2026-2603
8.1 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2026-03-18
- Last modified
- 2026-08-18
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 8.1 HIGH — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- CVSS 3.1 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)
- 8.1 HIGH — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- Weaknesses
- CWE-306
Description
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.
Affected configurations
• redhat build of keycloak (>= 26.2 < 26.2.14)
• redhat build of keycloak (>= 26.4 < 26.4.10)
Related
Weakness · CWE (1)
- CWE-306 Missing Authentication for Critical Functionality weakness
References
- https://access.redhat.com/errata/RHSA-2026:3925 Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:3926 Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:3947 Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:3948 Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-2603 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2440300 Exploit, Issue Tracking, Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:3925 Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:3926 Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:3947 Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:3948 Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-2603 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2440300 Exploit, Issue Tracking, Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2440300 Exploit, Issue Tracking, Vendor Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2603.json Vendor Advisory