Vulnerability Details CVE-2026-18208
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 10.2%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2026-18208
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cpe:2.3:a:redhat:build_of_keycloak:-