High severity8.1NVD Advisory· Published Aug 29, 2026
CVE-2026-82461
CVE-2026-82461
Description
pac4j-oidc before 6.5.6 fails to verify access token signatures, issuers, audiences, or expiry when extracting Keycloak realm and client roles. Attackers can forge access tokens with administrative roles paired with valid ID tokens to bypass authorization checks in applications relying on pac4j role validation.
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Patches
Vulnerability mechanics
References
4- github.com/pac4j/pac4j/blob/pac4j-parent-6.5.5/pac4j-oidc/src/main/java/org/pac4j/oidc/authorization/generator/KeycloakRolesAuthorizationGenerator.javanvd
- github.com/pac4j/pac4j/commit/2270c3ff70e93cc43831e75702acd5135531237envd
- www.pac4j.org/blog/security-advisory-pac4j-core-oidc-saml.htmlnvd
- www.vulncheck.com/advisories/pac4j-oidc-before-6.5.6-privilege-escalation-via-unverified-keycloak-access-tokennvd
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