CVE-2026-2603
High
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.
SeverityHigh
CVSS8.1
Exploit probability—
Product
Redhat Build Of Keycloak
PublishedMar 18, 2026
First seenMar 18, 2026
Weakness typeCWE-306Missing authentication for critical function
How to fix
Update
- redhat build_of_keycloak26.2.14, 26.4.10 or later
- org.keycloak:keycloak-services26.5.5 or later
- org.keycloak:keycloak-server-spi-private26.5.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| redhat build_of_keycloak | 26.2 ≤ v < 26.2.14, 26.4 ≤ v < 26.4.10 | 26.2.14, 26.4.10 |
| org.keycloak:keycloak-servicesMaven | v < 26.5.5 | 26.5.5 |
| org.keycloak:keycloak-server-spi-privateMaven | v < 26.5.5 | 26.5.5 |
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