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GHSA-7rh7-c77v-6434

CriticalCVSS 9.1 / 10
Published Jul 30, 2025·Last modified Feb 4, 2026
Affected Components(0)

No affected components available

Description

Impact

This vulnerability affects oauth2-proxy deployments using the skip_auth_routes configuration option with regex patterns. The vulnerability allows attackers to bypass authentication by crafting URLs with query parameters that satisfy the configured regex patterns, potentially gaining unauthorized access to protected resources.

The issue stems from skip_auth_routes matching against the full request URI (path + query parameters) instead of just the path as documented. This discrepancy enables authentication bypass attacks where attackers append malicious query parameters to access protected endpoints.

Example Attack:

  • Configuration: skip_auth_routes = [ "^/foo/.*/bar$" ]
  • Intended behavior: Allow /foo/something/bar
  • Actual vulnerability: Also allows /foo/critical_endpoint?param=/bar

Deployments using skip_auth_routes with regex patterns containing wildcards or broad matching patterns are most at risk, especially when backend services ignore unknown query parameters.

Patches

A patch has been released with version v7.11.0.

Workarounds

Immediate mitigations:

  1. Review regex patterns: Audit all skip_auth_routes configurations for overly permissive patterns
  2. Use precise patterns: Replace wildcard patterns with exact path matches where possible
  3. Anchor patterns: Ensure regex patterns are properly anchored (start with ^ and end with $)
  4. Path-only matching: Consider implementing custom validation that strips query parameters before regex matching

Example secure configuration:

# Instead of: "^/public/.*"
# Use specific paths: "^/public/assets$", "^/public/health$"
skip_auth_routes = ["^/public/assets$", "^/public/health$", "^/api/status$"]
Risk Scores
Base Score
9.1

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data.

Threat Intelligence
8.3

Exploitation activity has been observed. Apply available patches or mitigations urgently.

EPSS
1.13%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Critical severity
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