OAuth2-Proxy up to 7.10.x skip_auth_routes Configuration Options authentication spoofing

Summaryinfo

A vulnerability, which was classified as critical, has been found in OAuth2-Proxy up to 7.10.x. Affected is an unknown function of the component skip_auth_routes Configuration Options Handler. This manipulation causes authentication spoofing. This vulnerability is handled as CVE-2025-54576. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in OAuth2-Proxy up to 7.10.x and classified as critical. Affected by this vulnerability is an unknown functionality of the component skip_auth_routes Configuration Options Handler. The manipulation with an unknown input leads to a authentication spoofing vulnerability. The CWE definition for the vulnerability is CWE-290. This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

OAuth2-Proxy is an open-source tool that can act as either a standalone reverse proxy or a middleware component integrated into existing reverse proxy or load balancer setups. In versions 7.10.0 and below, oauth2-proxy deployments are vulnerable when using the skip_auth_routes configuration option with regex patterns. Attackers can bypass authentication by crafting URLs with query parameters that satisfy configured regex patterns, allowing unauthorized access to protected resources. The issue stems from skip_auth_routes matching against the full request URI. Deployments using skip_auth_routes with regex patterns containing wildcards or broad matching patterns are most at risk. This issue is fixed in version 7.11.0. Workarounds include: auditing all skip_auth_routes configurations for overly permissive patterns, replacing wildcard patterns with exact path matches where possible, ensuring regex patterns are properly anchored (starting with ^ and ending with $), or implementing custom validation that strips query parameters before regex matching.

The advisory is shared at github.com. This vulnerability is known as CVE-2025-54576 since 07/25/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available.

Upgrading to version 7.11.0 eliminates this vulnerability.

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Productinfo

Type

• Firewall Software

Name

• OAuth2-Proxy

Version

• 7.0
• 7.1
• 7.2
• 7.3
• 7.4
• 7.5
• 7.6
• 7.7
• 7.8
• 7.9
• 7.10

Website

• Product: https://github.com/oauth2-proxy/oauth2-proxy/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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