8.1
High
CVE-2026-2603 A flaw was found in Keycloak
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 products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Red Hat build of Keycloak 26.2 26.2 | earliest → < 26.2-16 | 26.2-16 |
| Red Hat build of Keycloak 26.4 26.4 | earliest → < 26.4-12 | 26.4-12 |
| Red Hat build of Keycloak 26.2.14 | Versions not published | |
| Red Hat build of Keycloak 26.4.10 | Versions not published |
References
- RHSA-2026:3925 access.redhat.com
- RHSA-2026:3926 access.redhat.com
- RHSA-2026:3947 access.redhat.com
- RHSA-2026:3948 access.redhat.com
- access.redhat.com access.redhat.com
- RHBZ#2440300 bugzilla.redhat.com
Timeline
- Published
- Last modified
Other CVEs of Red Hat build of Keycloak 26.2
The 26 CVEs of Red Hat build of Keycloak 26.2 →
CVE-2026-7507
A session fixation vulnerability was found in Keycloak's login-actions endpoints
7.5
High
CVE-2026-7504
A flaw was found in Keycloak's URL validation logic during redirect operations
8.1
High
CVE-2026-7307
A flaw was found in Keycloak
7.5
High
CVE-2026-4636
A flaw was found in Keycloak
8.1
High