CVE-2026-20896
CriticalPublished
Gitea Docker image trusts spoofable reverse-proxy headers by default
- Published
- Jul 3, 2026
- Updated
- Jul 7, 2026
- Assigning CNA
- Gitea
- Evidence observed
- Aug 8, 2026
Primary CVSS
9.8/ 10Critical
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H2.8%
Low · next 30 days
- Percentile
- 86.0%
- Model date
- Oct 17, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
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.
Sources
Repository evidence: Files: 1 · Repositories: 1
1 Template
http/cves/2026/CVE-2026-20896.yaml
Nuclei TemplatesDeclared conditions
- network: http($.protocol_keys)
- verification: dsl($.matchers[*].type)
Gitea Docker Image Authentication Bypass
Responsible use
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