CVE-2026-2603
Keycloak: keycloak: unauthorized authentication via disabled saml identity provider
- State
- Published
- Severity
- 8.1 High
- Published
- Mar 18, 2026
- Updated
- Jul 15, 2026
- Reserved
- Feb 16, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 8.1 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N | redhat |
| 3.1 | 8.1 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N | redhat-SADP |
Weaknesses
- CWE-306 Missing Authentication for Critical Function
Affected Products
| Product | Versions |
|---|---|
Red Hat build of Keycloak 26.2Red Hat |
|
Red Hat build of Keycloak 26.2Red Hat |
|
Red Hat build of Keycloak 26.2Red Hat |
|
Red Hat build of Keycloak 26.2.14Red Hat | |
Red Hat build of Keycloak 26.4Red Hat |
|
Red Hat build of Keycloak 26.4Red Hat |
|
Red Hat build of Keycloak 26.4Red Hat |
|
Red Hat build of Keycloak 26.4.10Red Hat |
References
- RHSA-2026:3925vendor-advisory
- RHSA-2026:3926vendor-advisory
- RHSA-2026:3947vendor-advisory
- RHSA-2026:3948vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-2603vdb-entry
- RHBZ#2440300issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2603.json
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