User Impersonation Affecting github.com/oauth2-proxy/oauth2-proxy/pkg/requests/util package, versions <7.11.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published31 Jul 2025
- disclosed30 Jul 2025
- creditUnknown
Introduced: 30 Jul 2025
NewCVE-2025-54576 Â (opens in a new tab)How to fix?
Upgrade github.com/oauth2-proxy/oauth2-proxy/pkg/requests/util to version 7.11.0 or higher.
Overview
Affected versions of this package are vulnerable to User Impersonation due to using the skip_auth_routes configuration option with regex patterns. An attacker can gain unauthorized access to protected resources by crafting URLs with query parameters that match overly broad or improperly anchored regex patterns configured in skip_auth_routes.
Note:
This is only exploitable if the deployment uses skip_auth_routes with regex patterns that include wildcards or are not properly anchored.
Workaround
This vulnerability can be mitigated by auditing all skip_auth_routes configurations for overly permissive patterns, replacing wildcard patterns with exact path matches, ensuring regex patterns are properly anchored (starting with ^ and ending with $), or implementing custom validation that strips query parameters before regex matching.