CVE-2026-1486: Red Hat Build Of Keycloak 26.4

High severity, CVSS 8.8. EPSS: 0.5% chance of exploitation in the next 30 days.

A flaw was found in Keycloak. A vulnerability exists in the jwt-authorization-grant flow where the server fails to verify if an Identity Provider (IdP) is enabled before issuing tokens. The issuer lookup mechanism (lookupIdentityProviderFromIssuer) retrieves the IdP configuration but does not filter for isEnabled=false. If an administrator disables an IdP (e.g., due to a compromise or offboarding), an entity possessing that IdP's signing key can still generate valid JWT assertions that Keycloak accepts, resulting in the issuance of valid access tokens.

Affected products

• Red Hat Red Hat Build Of Keycloak 26.4: before 26.4.9-1 (fixed in 26.4.9-1); before 26.4-11 (fixed in 26.4-11); before 26.4-10 (fixed in 26.4-10)
• Red Hat Red Hat Build Of Keycloak 26.4.9

Published 2026-02-09. Last modified 2026-07-15.