OAuth2-Proxy Vulnerability Enables Authentication Bypass by Manipulating Query Parameters

A critical security vulnerability has been identified in OAuth2-Proxy, a widely-used reverse proxy that provides authentication services for Google, Azure, OpenID Connect, and numerous other identity providers.  The vulnerability, designated as CVE-2025-54576, enables attackers to bypass authentication mechanisms by manipulating query parameters in crafted URLs, potentially granting unauthorized access to protected resources. Key Takeaways1. OAuth2-Proxy […]

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