CVE-2025-54576
OAuth2-Proxy has authentication bypass in oauth2-proxy skip_auth_routes due to Query Parameter inclusion
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.
INFO
Published Date :
July 30, 2025, 8:15 p.m.
Last Modified :
Sept. 10, 2025, 2:36 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update OAuth2-Proxy to version 7.11.0 or later.
- Audit and restrict skip_auth_routes regex patterns.
- Replace wildcards with exact path matches if possible.
- Anchor regex patterns with ^ and $ symbols.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-54576.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-54576 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-54576
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-54576 vulnerability anywhere in the article.
-
CybersecurityNews
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 ... Read more
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Daily CyberSecurity
Lazarus Group’s Covert Supply Chain Attack: North Korean APT Poisons Open Source to Steal Developer Secrets
Image: Sonatype In a recently expose, Sonatype reveals a covert cyberespionage campaign orchestrated by the North Korea-linked Lazarus Group, targeting developers through poisoned open source packages ... Read more
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Daily CyberSecurity
Critical OAuth2-Proxy Flaw (CVE-2025-54576, CVSS 9.1) Allows Authentication Bypass via Query Parameters
A critical vulnerability in the popular OAuth2-Proxy open-source authentication tool has been discovered, allowing attackers to bypass authentication protections by manipulating query parameters. Trac ... Read more
The following table lists the changes that have been made to the
CVE-2025-54576 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Sep. 10, 2025
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:*:*:*:*:*:*:*:* versions up to (excluding) 7.11.0 Added Reference Type GitHub, Inc.: https://github.com/oauth2-proxy/oauth2-proxy/blob/f4b33b64bd66ad28e9b0d63bea51837b83c00ca1/oauthproxy.go#L582-L584 Types: Product Added Reference Type GitHub, Inc.: https://github.com/oauth2-proxy/oauth2-proxy/blob/f4b33b64bd66ad28e9b0d63bea51837b83c00ca1/pkg/requests/util/util.go#L37-L44 Types: Product Added Reference Type GitHub, Inc.: https://github.com/oauth2-proxy/oauth2-proxy/commit/9ffafad4b2d2f9f7668e5504565f356a7c047b77 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/oauth2-proxy/oauth2-proxy/releases/tag/v7.11.0 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-7rh7-c77v-6434 Types: Exploit, Mitigation, Vendor Advisory Added Reference Type GitHub, Inc.: https://oauth2-proxy.github.io/oauth2-proxy/configuration/overview/#proxy-options Types: Product -
New CVE Received by [email protected]
Jul. 30, 2025
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Added CWE CWE-290 Added Reference https://github.com/oauth2-proxy/oauth2-proxy/blob/f4b33b64bd66ad28e9b0d63bea51837b83c00ca1/oauthproxy.go#L582-L584 Added Reference https://github.com/oauth2-proxy/oauth2-proxy/blob/f4b33b64bd66ad28e9b0d63bea51837b83c00ca1/pkg/requests/util/util.go#L37-L44 Added Reference https://github.com/oauth2-proxy/oauth2-proxy/commit/9ffafad4b2d2f9f7668e5504565f356a7c047b77 Added Reference https://github.com/oauth2-proxy/oauth2-proxy/releases/tag/v7.11.0 Added Reference https://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-7rh7-c77v-6434 Added Reference https://oauth2-proxy.github.io/oauth2-proxy/configuration/overview/#proxy-options