CVE-2025-54576

Published Jul 30, 2025

Last updated a month ago

OAuth2-Proxy

Overview

AI description

Automated description summarized from trusted sources.

CVE-2025-54576 is a vulnerability affecting OAuth2-Proxy, an open-source tool used for providing authentication services. The vulnerability exists in versions 7.10.0 and below when the `skip_auth_routes` configuration option is used with regular expression (regex) patterns. Attackers can bypass authentication by crafting URLs with specific query parameters that satisfy the configured regex patterns. This can lead to unauthorized access to protected resources. The issue arises because `skip_auth_routes` incorrectly matches against the entire request URI (path + query parameters) instead of just the path, as documented. This discrepancy allows attackers to append malicious query parameters to access protected endpoints, even if the base path is intended to be protected. Deployments using `skip_auth_routes` with regex patterns containing wildcards or broad matching patterns are particularly at risk.

Description: 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.
Source: security-advisories@github.com
NVD status: Awaiting Analysis

Risk scores

CVSS 3.1

Type: Secondary
Base score: 9.1
Impact score: 5.2
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Severity: CRITICAL

Weaknesses

security-advisories@github.com: CWE-290

Hype score: Not currently trending

References