Authentication Bypass Using an Alternate Path or Channel Affecting github.com/oauth2-proxy/oauth2-proxy/v7/pkg/requests/util package, versions <7.15.2
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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- published22 Apr 2026
- disclosed22 Apr 2026
- creditHarsh Jaiswal
Introduced: 22 Apr 2026
CVE-2026-41059 Â (opens in a new tab)How to fix?
Upgrade github.com/oauth2-proxy/oauth2-proxy/v7/pkg/requests/util to version 7.15.2 or higher.
Overview
Affected versions of this package are vulnerable to Authentication Bypass Using an Alternate Path or Channel in the processing of request paths containing a number sign (#) or its encoded form (%23) when using skip_auth_routes or skip_auth_regex settings. An attacker can gain unauthorized access to protected resources by crafting requests that exploit fragment confusion, causing the proxy to incorrectly match public allowlist rules while the backend serves sensitive content.
Note:
This is only exploitable if the deployment uses skip_auth_routes or skip_auth_regex with patterns that can be widened by attacker-controlled suffixes, and the protected upstream application interprets # as a fragment delimiter or routes the request to the protected base path.