EUVD-2026-51381

An authentication bypass and audience confusion vulnerability exists in the Google OAuth provider component of Google mcp-toolbox version 1.4.0. When a Google authService is initialized with mcpEnabled: true but lacks an explicitly defined audience or clientId, the ValidateMCPAuth pipeline for...

EUVD-2026-42958

ZITADEL is an open source identity management platform. Prior to 3.4.12 and 4.15.2, ZITADEL's external JWT Identity Provider validates a token's signature and issuer iss but not the audience aud claim, allowing a validly signed token from a trusted issuer for another relying party to be accepted ...

Improper Authentication

Overview Affected versions of this package are vulnerable to Improper Authentication in the OIDC authenticator. An attacker can gain access to the API by presenting a JWT that a shared identity provider issued for an unrelated service, because the token's audience aud claim is not validated. This...

ZITADEL: Missing Token Audience Validation (`aud`) in JWT IdP Provider

Summary An authentication bypass vulnerability was discovered in ZITADEL's external JWT Identity Provider IdP implementation. When validating JSON Web Tokens JWTs from an external provider, ZITADEL properly checks the token's cryptographic signature and issuer iss, but it fails to validate the...

GHSA-FFG9-J72F-J6XM Fleet Windows MDM Azure AD JWT Authentication Bypass

Summary A vulnerability in Fleet's Windows MDM enrollment flow allows authentication tokens from any Azure AD tenant to be accepted. Because Fleet validates JWT signatures using Microsoft's multi-tenant JWKS endpoint but does not enforce the aud audience or iss issuer claims, any Microsoft-signed...