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CVE-2026-40575 is a configuration-dependent authentication bypass in OAuth2 Proxy versions 7.5.0 through 7.15.1. When reverse-proxy mode is enabled and at least one skip-auth route or regular-expression rule is configured, OAuth2 Proxy may trust a client-controlled X-Forwarded-Uri header when evaluating whether authentication should be skipped. An attacker can supply a header value matching an allow-listed path while requesting a different, protected path. OAuth2 Proxy evaluates the skip-auth decision against the spoofed value, while the upstream application receives the original protected request.
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14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A previously addressed or referenced OAuth2 Proxy vulnerability whose guard is described as ineffective in the default reverse-proxy configuration in the context of CVE-2026-76835.
An authentication bypass vulnerability in OAuth2 Proxy where a client-supplied X-Forwarded-Uri header can influence skip-auth decisions because trusted proxy handling defaults to trusting all clients in reverse-proxy mode.
An authentication bypass vulnerability in OAuth2 Proxy caused by trusting a client-supplied X-Forwarded-Uri header under specific reverse-proxy and skip-auth configurations, allowing unauthenticated remote access to protected routes.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.