Authentication Bypass

Traefik is vulnerable to Authentication Bypass. The vulnerability is due to improper handling in the ForwardAuth middleware when trustForwardHeader=false is configured behind a trusted upstream proxy, which allows an attacker to bypass authentication controls and gain unauthorized access...

CVE-2026-40912

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a high severity authentication bypass vulnerability in Traefik's StripPrefixRegex middleware when used in combination with ForwardAuth, BasicAuth, or DigestAuth. The middleware matches...

CVE-2026-40912

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a high severity authentication bypass vulnerability in Traefik's StripPrefixRegex middleware when used in combination with ForwardAuth, BasicAuth, or DigestAuth. The middleware matches...

CVE-2026-40912

CVE-2026-40912 affects Traefik’s StripPrefixRegex middleware used with ForwardAuth, BasicAuth, or DigestAuth. The vulnerability arises because the middleware matches a decoded URL path against a regex but uses that length to slice the percent-encoded RawPath, which can produce a dot-segment (e.g....

CVE-2026-39858

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a high severity authentication bypass vulnerability in Traefik's ForwardAuth and snippet-based authentication middleware. Traefik's forwarded-header sanitization logic targets only...

Use of Incorrectly-Resolved Name or Reference

Overview Affected versions of this package are vulnerable to Use of Incorrectly-Resolved Name or Reference in StripPrefixRegex, when used together with ForwardAuth, BasicAuth, or DigestAuth. An attacker can gain unauthorized access to protected backend resources by sending requests with...

GHSA-6JWX-7VP4-9847 Traefik has an StripPrefixRegex Middleware Authorization Bypass via Path/RawPath Desync

Summary There is a high severity authentication bypass vulnerability in Traefik's StripPrefixRegex middleware when used in combination with ForwardAuth, BasicAuth, or DigestAuth. The middleware matches the regex against the decoded URL path but uses the resulting byte length to slice the...

Use of Incorrectly-Resolved Name or Reference

Overview Affected versions of this package are vulnerable to Use of Incorrectly-Resolved Name or Reference in StripPrefixRegex, when used together with ForwardAuth, BasicAuth, or DigestAuth. An attacker can gain unauthorized access to protected backend resources by sending requests with...

Use of Incorrectly-Resolved Name or Reference

Overview Affected versions of this package are vulnerable to Use of Incorrectly-Resolved Name or Reference in StripPrefixRegex, when used together with ForwardAuth, BasicAuth, or DigestAuth. An attacker can gain unauthorized access to protected backend resources by sending requests with...

Insufficient Verification of Data Authenticity

Overview Affected versions of this package are vulnerable to Insufficient Verification of Data Authenticity in the ForwardAuth middleware when trustForwardHeader is set to false and the deployment is behind a trusted upstream proxy. An attacker can gain unauthorized access to protected backend...

Insufficient Verification of Data Authenticity

Overview Affected versions of this package are vulnerable to Insufficient Verification of Data Authenticity in the ForwardAuth middleware when trustForwardHeader is set to false and the deployment is behind a trusted upstream proxy. An attacker can gain unauthorized access to protected backend...

PT-2026-36178

Name of the Vulnerable Software and Affected Versions Traefik versions prior to 2.11.43 Traefik versions prior to 3.6.14 Traefik versions prior to 3.7.0-rc.2 Description An authentication bypass exists in the ForwardAuth and snippet-based authentication middleware. The forwarded-header sanitizati...

PT-2026-36179

Name of the Vulnerable Software and Affected Versions Traefik versions prior to 2.11.43 Traefik versions prior to 3.6.14 Traefik versions prior to 3.7.0-rc.2 Description An authentication bypass exists in the StripPrefixRegex middleware when used with ForwardAuth, BasicAuth, or DigestAuth. The...

BIT-AUTHENTIK-2026-25748 authentik has a forward authentication bypass with broken cookie

authentik is an open-source identity provider. Prior to 2025.10.4 and 2025.12.4, with a malformed cookie it was possible to bypass authentication when using forward authentication in the authentik Proxy Provider when used in conjunction with Traefik or Caddy as reverse proxy. When a malicious...

BIT-APISIX-2026-31908 Apache APISIX: forward auth plugin allows header injection

Header injection vulnerability in Apache APISIX. The attacker can take advantage of certain configuration in forward-auth plugin to inject malicious headers. This issue affects Apache APISIX: from 2.12.0 through 3.15.0. Users are recommended to upgrade to version 3.16.0, which fixes the issue...

CVE-2026-31908

Header injection vulnerability in Apache APISIX. The attacker can take advantage of certain configuration in forward-auth plugin to inject malicious headers. This issue affects Apache APISIX: from 2.12.0 through 3.15.0. Users are recommended to upgrade to version 3.16.0, which fixes the issue...

CVE-2026-31908

Header injection vulnerability in Apache APISIX. The attacker can take advantage of certain configuration in forward-auth plugin to inject malicious headers. This issue affects Apache APISIX: from 2.12.0 through 3.15.0. Users are recommended to upgrade to version 3.16.0, which fixes the issue...

PT-2026-32601

Header injection vulnerability in Apache APISIX. The attacker can take advantage of certain configuration in forward-auth plugin to inject malicious headers. This issue affects Apache APISIX: from 2.12.0 through 3.15.0. Users are recommended to upgrade to version 3.16.0, which fixes the issue...

Apache Apisix 安全漏洞

Apache Apisix is a cloud-native microservices API gateway service provided by the Apache Foundation in the United States. This software is implemented based on OpenResty and etcd, featuring dynamic routing and hot loading of plugins. It is suitable for API management within microservice systems...

CVE-2026-30851

Caddy is an extensible server platform that uses TLS by default. From version 2.10.0 to before version 2.11.2, forwardauth copyheaders does not strip client-supplied headers, allowing identity injection and privilege escalation. This issue has been patched in version 2.11.2...