Medium severity6.5NVD Advisory· Published Aug 29, 2026
CVE-2026-82462
CVE-2026-82462
Description
pac4j-oidc before 6.5.6 accepts OIDC callbacks carrying only an access token without authorization code or ID token validation. Attackers can substitute access tokens minted for other clients to create authenticated sessions without proper issuer, audience, nonce, or subject verification.
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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/credentials/extractor/OidcCredentialsExtractor.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-authentication-bypass-via-access-token-substitutionnvd
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