CVE-2026-20896 PUBLISHED

Gitea Docker image trusts spoofable reverse-proxy headers by default

Assigner: Gitea
Reserved: 03.03.2026 Published: 03.07.2026 Updated: 03.07.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 9.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	Gitea
Product	Gitea Open Source Git Server
Versions	Default: unaffected affected from 0 to 1.26.2 (incl.)

Credits

rz1027 reporter

References

GitHub Security Advisory
GitHub Pull Request #38151
Gitea v1.26.3 Release
Gitea v1.26.4 Release Blog Post

Problem Types

CWE-284 CWE