OAuth2 Proxy - Authentication Bypass via X-Forwarded-Uri Header Spoofing
Classification: Severe, Solution: Official Fix, Exploit Maturity: Not Defined, CVSSv3.1: 9.3, CVEs: CVE-2026-76835, Summary: OAuth2 Proxy honours a client-supplied X-Forwarded-Uri header when deciding whether a request may skip authentication, because the guard added for CVE-2026-40575 is inert in the default reverse-proxy configuration. GetRequestURI in pkg/requests/util/util.go prefers that header over the real request URI whenever CanTrustForwardedHeaders returns true, and isAllowedPath in…
EPSS 0.00 CVSS 9.3 CVE-2026-40575 CVE-2026-76835 OAuth2 Proxy FI