CVE-2026-31908

CVE-2026-31908 - Apache APISIX Header Injection Exploit 📋 Overview This is a Proof of Concept PoC exploit for CVE-2026-31908 , a critical header injection vulnerability discovered in Apache APISIX versions 2.12.0 through 3.15.0. The vulnerability exists in the forward-auth plugin, where improper...

PT-2026-105573

Tinyauth: forward-auth per-app ACL is matched case-sensitively against the case-insensitive hostname, letting an authenticated user reach apps they are not on the allowlist for in github.com/tinyauthapp/tinyauth...

GHSA-328G-JX67-V94G Tinyauth: forward-auth per-app ACL is matched case-sensitively against the (case-insensitive) hostname, letting an authenticated user reach apps they are not on the allowlist for

tinyauth: forward-auth per-app ACL is matched case-sensitively against the case-insensitive hostname, letting an authenticated user reach apps they are not on the allowlist for GitHub Advisory Details form fields — paste-ready Affected products | Field | Value | |-------|-------| | Ecosystem |...

Tinyauth: forward-auth per-app ACL is matched case-sensitively against the (case-insensitive) hostname, letting an authenticated user reach apps they are not on the allowlist for

tinyauth: forward-auth per-app ACL is matched case-sensitively against the case-insensitive hostname, letting an authenticated user reach apps they are not on the allowlist for GitHub Advisory Details form fields — paste-ready Affected products | Field | Value | |-------|-------| | Ecosystem |...

CVE-2026-49446 Cosmos: Authentication bypass via forward-auth header smuggling on Constellation tunnel in Cosmos-Server

Cosmos provides users the ability self-host a home server by acting as a secure gateway to your application, as well as a server manager. Prior to 0.22.19, tokenMiddleware in src/proxy/routerGen.go can return through the Constellation tunnel bypass before removing x-cosmos-user, x-cosmos-role,...

CVE-2026-49446 Cosmos: Authentication bypass via forward-auth header smuggling on Constellation tunnel in Cosmos-Server

Cosmos provides users the ability self-host a home server by acting as a secure gateway to your application, as well as a server manager. Prior to 0.22.19, tokenMiddleware in src/proxy/routerGen.go can return through the Constellation tunnel bypass before removing x-cosmos-user, x-cosmos-role,...

GO-2026-6123 Cosmos-Server has an authentication bypass via forward-auth header smuggling on Constellation tunnel in github.com/azukaar/cosmos-server

Cosmos-Server has an authentication bypass via forward-auth header smuggling on Constellation tunnel in github.com/azukaar/cosmos-server...

PT-2026-80368

Cosmos-Server has an authentication bypass via forward-auth header smuggling on Constellation tunnel in github.com/azukaar/cosmos-server...

CVE-2026-71324

Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.53, 3.6.24, and 3.7.9, Traefik's default HTTP reverse proxy forwards a plain HTTP/2 or HTTP/3 CONNECT request and its body to an HTTP/1.1 upstream through a shared net/http.Transport. When the upstream answers the CONNE...

Traefik: ForwardAuth middleware leaks X-Forwarded-Port spoofing via untrusted X-Forwarded-Proto when trustForwardHeader=false

Summary There is a medium severity vulnerability in Traefik's ForwardAuth middleware. Even when configured with trustForwardHeader: false, Traefik derives the X-Forwarded-Port header sent to the authentication service from the original incoming request instead of the sanitized forwarded request. ...

CVE-2026-71324 Traefik: Cross-user response poisoning via proxied CONNECT on Traefik's shared backend keep-alive pool

Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.53, 3.6.24, and 3.7.9, Traefik's default HTTP reverse proxy forwards a plain HTTP/2 or HTTP/3 CONNECT request and its body to an HTTP/1.1 upstream through a shared net/http.Transport. When the upstream answers the CONNE...

GHSA-2RX5-2G7J-2659 Cosmos-Server has an authentication bypass via forward-auth header smuggling on Constellation tunnel

Summary The Constellation-tunnel bypass branch in tokenMiddleware at src/proxy/routerGen.go:53-66 returns to the upstream handler before the request's x-cosmos-user, x-cosmos-role, x-cosmos-user-role, and x-cosmos-mfa headers are stripped at lines 68-72, and before the AdminOnlyWithRedirect gate ...

PT-2026-65683

Name of the Vulnerable Software and Affected Versions Cosmos-Server affected versions not specified Description An authentication bypass exists in the tokenMiddleware function within src/proxy/routerGen.go. The issue occurs when the Constellation-tunnel bypass branch is triggered, causing the...

GO-2026-5346 Caddy: FastCGI header normalization bypass in forward_auth copy_headers in github.com/caddyserver/caddy

Caddy: FastCGI header normalization bypass in forwardauth copyheaders in github.com/caddyserver/caddy...

CVE-2026-54763 Traefik: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth

Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's BasicAuth, DigestAuth, and ForwardAuth middlewares strip canonical-cased spoofed identity headers before writing Traefik's own value, but do not account for underscore-variant header names, which...

CVE-2026-54763

Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's BasicAuth, DigestAuth, and ForwardAuth middlewares strip canonical-cased spoofed identity headers before writing Traefik's own value, but do not account for underscore-variant header names, which...

The vulnerability of the forward-auth plugin for the Apache APISIX cloud API gateway allows attackers to perform spoofing attacks.

The vulnerability of the forward-auth plugin for the Apache APISIX cloud API gateway is related to insufficient validation of input data. Exploiting this vulnerability allows a malicious actor to perform spoofing attacks remotely...

CVE-2026-52845

Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, forwardauth copyheaders deletes the exact client-supplied identity header before copying the trusted value from the auth gateway. But when the request later goes through phpfastcgi, Caddy normalizes HTTP headers int...

BIT-APISIX-2026-39998 Apache APISIX: Identity Injection via forward-auth Plugin Missing Header Cleanup

Improper Input Validation vulnerability in Apache APISIX. The attacker can take advantage of certain configuration in forward-auth plugin to spoof identity headers. This issue affects Apache APISIX: from 2.12.0 through 3.16.0. Users are recommended to upgrade to version 3.17.0, which fixes the...

CVE-2026-39998

Improper Input Validation vulnerability in Apache APISIX. The attacker can take advantage of certain configuration in forward-auth plugin to spoof identity headers. This issue affects Apache APISIX: from 2.12.0 through 3.16.0. Users are recommended to upgrade to version 3.17.0, which fixes the...