CVE-2026-20896

CVE-2026-20896: PoC de omisión de autenticación en la imagen Docker de Gitea !WARNING Usa este PoC solo en un laboratorio local o contra un sistema que estés autorizado explícitamente a probar. https://github.com/user-attachments/assets/b73af2fe-0e59-438b-80d6-be93fd75697b Resumen CVE-2026-20896 ...

cve-2026-20896-gitea-poc

CVE-2026-20896 Gitea Docker Auth Bypass Checker Authorized red team / pentest operations only. This repository contains a minimal checker for CVE-2026-20896, an authentication bypass in official Gitea Docker images up to and including 1.26.2 when reverse-proxy authentication is enabled. What...

Gitea Docker image: `REVERSE_PROXY_TRUSTED_PROXIES = *` default lets any source IP impersonate any user via `X-WEBAUTH-USER`

Summary The Gitea Docker images ship an app.ini template that hard-codes: REVERSEPROXYTRUSTEDPROXIES = The documented default for this setting, in custom/conf/app.example.ini, is 127.0.0.0/8,::1/128, i.e. only loopback is trusted. When an admin enables ENABLEREVERSEPROXYAUTHENTICATION = true to p...

Threat Actors Probe Gitea Docker Flaw CVE-2026-20896 13 Days After Disclosure

Threat actors have been observed attempting to exploit a recently patched critical security flaw in Gitea Docker images, according to Sysdig. The vulnerability in question is CVE-2026-20896 CVSS score: 9.8, a vulnerability that stems from the DevOps platform trusting the "X-WEBAUTH-USER" header...

CVE-2026-20896

Gitea Docker images up to 1.26.2 ship REVERSE_PROXY_TRUSTED_PROXIES = *, which allows any source IP to spoof and impersonate a user via X-WEBAUTH-USER when reverse-proxy authentication is enabled. This affects gitea/gitea:1.26.2 and related Docker templates, enabling unauthenticated impersonation...