---
id: CVE-2026-20896
title: >-
  Gitea Docker image versions up to and including 1.26.2 use
  REVERSE_PROXY_TRUSTED_PROXIES=* by default, allowing any source IP to
  impersonate a user when reverse-proxy authentication headers such as
  X-WEBAUTH-USER are enabled.
summary: >-
  Gitea Docker image versions up to and including 1.26.2 use
  REVERSE_PROXY_TRUSTED_PROXIES=* by default, allowing any source IP to
  impersonate a user when reverse-proxy authentication headers such as
  X-WEBAUTH-USER are enabled.
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-284
published: '2026-07-03'
updated: '2026-07-03'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-20896'
references:
  - url: 'https://blog.gitea.com/release-of-1.26.3-and-1.26.4/'
    label: 88ee5874-cf24-4952-aea0-31affedb7ff2
  - url: 'https://github.com/go-gitea/gitea/pull/38151'
    label: 88ee5874-cf24-4952-aea0-31affedb7ff2
  - url: 'https://github.com/go-gitea/gitea/releases/tag/v1.26.3'
    label: 88ee5874-cf24-4952-aea0-31affedb7ff2
  - url: 'https://github.com/go-gitea/gitea/security/advisories/GHSA-f75j-4cw6-rmx4'
    label: 88ee5874-cf24-4952-aea0-31affedb7ff2
tags:
  - nvd
  - exploit-available
epss: 0.02755
epssPercentile: 0.85605
ingestedAt: '2026-07-04T13:56:12.041Z'
exploits:
  github: 6
  githubRepos:
    - 'https://github.com/szybnev/cve-2026-20896-gitea-poc'
    - 'https://github.com/rz1027/CVE-2026-20896'
    - 'https://github.com/XaocZenon/CVE-2026-20896'
  nuclei:
    - CVE-2026-20896
  checkedAt: '2026-09-24T07:53:00.589Z'
exploitAvailable: true
---

## Overview

Gitea Docker image versions up to and including 1.26.2 use REVERSE_PROXY_TRUSTED_PROXIES=* by default, allowing any source IP to impersonate a user when reverse-proxy authentication headers such as X-WEBAUTH-USER are enabled.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.