---
title: "CVE-2025-54576: OAuth2-Proxy has authentication bypass in oauth2-proxy skip_auth_routes due to Query Parameter inclusion"
url: https://erroneo.us/security/cve/CVE-2025-54576/
description: "CVE-2025-54576 (github.com/oauth2-proxy/oauth2-proxy/v7 (Go)): OAuth2-Proxy is an open-source tool that can act as either a standalone reverse proxy or a…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-07-30
date_modified: 2025-07-31
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-54576"
kev: false
cvss: 9.1
epss: 0.012
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-54576: OAuth2-Proxy has authentication bypass in oauth2-proxy skip_auth_routes due to Query Parameter inclusion

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 1.2% , percentile 68: FIRST’s model estimates a 1.2% chance of exploitation activity in the next 30 days, higher than 68% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes github.com/oauth2-proxy/oauth2-proxy/v7 (Go) <= 7.10.0, fixed in 7.11.0 . Check your lockfile, including transitive dependencies.

## What it 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 skipauthroutes 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 skipauthroutes matching against the full request URI. Deployments using skipauthroutes 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 skipauthroutes 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.

## Affected packages

- Go `github.com/oauth2-proxy/oauth2-proxy/v7` <= 7.10.0 → fixed: 7.11.0

## Affected products (CVE record)

- oauth2-proxy oauth2-proxy: < 7.11.0

## Severity

- GitHub_M CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`
- GitHub CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 1.20% probability of exploitation activity in the next 30 days; percentile 68.

## Sources

- [GitHub Advisory GHSA-7rh7-c77v-6434](https://github.com/advisories/GHSA-7rh7-c77v-6434)
- [CVE.org record CVE-2025-54576](https://www.cve.org/CVERecord?id=CVE-2025-54576)
- [NVD entry CVE-2025-54576](https://nvd.nist.gov/vuln/detail/CVE-2025-54576)
- [github.com](https://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-7rh7-c77v-6434)
- [github.com](https://github.com/oauth2-proxy/oauth2-proxy/commit/9ffafad4b2d2f9f7668e5504565f356a7c047b77)
- [github.com](https://github.com/oauth2-proxy/oauth2-proxy/blob/f4b33b64bd66ad28e9b0d63bea51837b83c00ca1/oauthproxy.go#L582-L584)
- [github.com](https://github.com/oauth2-proxy/oauth2-proxy/blob/f4b33b64bd66ad28e9b0d63bea51837b83c00ca1/pkg/requests/util/util.go#L37-L44)
- [github.com](https://github.com/oauth2-proxy/oauth2-proxy/releases/tag/v7.11.0)
- [oauth2-proxy.github.io](https://oauth2-proxy.github.io/oauth2-proxy/configuration/overview/#proxy-options)

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Source page: https://erroneo.us/security/cve/CVE-2025-54576/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt