8.8
High
CVE-2026-1486 A flaw was found in Keycloak
Description
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 and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Red Hat Build of Keycloak | Versions not published | |
| Red Hat build of Keycloak 26.4 26.4 | earliest → < 26.4-10 | 26.4-10 |
| Red Hat build of Keycloak 26.4.9 | Versions not published |
References
- RHSA-2026:2365 access.redhat.com
- RHSA-2026:2366 access.redhat.com
- access.redhat.com access.redhat.com
- RHBZ#2433347 bugzilla.redhat.com
Timeline
- Published
- Last modified
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