CVE-2026-18208

Description

A flaw was found in the OIDC token introspection endpoint of the keycloak-services component. Keycloak is an open-source identity and access management solution used to secure modern applications and services. The issue occurs when a confidential client, configured to receive signed JWT introspection responses, attempts to introspect a token issued for a different audience. Although the endpoint correctly identifies the token as inactive for that client, it still returns the full set of token claims within a signed JWT field. This allows an unauthorized client to bypass audience-based restrictions and access sensitive information contained in the token.

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Produits concernés

• Red Hat Build of Keycloak
• Red Hat Data Grid 8
• Red Hat JBoss Enterprise Application Platform Expansion Pack
• Red Hat Single Sign-On 7
• Redhat build of keycloak

Scores CVSS

Faiblesses (CWE)

• CWE-862

Références

• https://access.redhat.com/security/cve/CVE-2026-18208 Vendor Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2508304 Issue TrackingVendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories