CVE-2026-20896

FAUCET Score

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.

First published: Jul 3, 2026Last modified: Jul 3, 2026

Impacted Technologies

Vendor	Product	Version(s)	CPE
Gitea	Gitea Open Source Git Server	>= 0, <= 1.26.2CNA affecteddefault unaffected

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

Exploitability Score

3.9

Impact Score

5.9

CvssVersion

3.1

Exploit Intelligence

EPSS Score

31.81%

Probability of exploitation in next 30 days

EPSS Percentile

98.1%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.3181 is in the 95th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

gopatch availablevia ghsa

Product: code.gitea.io/giteaFixed in: 1.26.3

Vendor Advisories (1)

goGHSA-f75j-4cw6-rmx4critical

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

Jul 21, 2026

References

blog.gitea.com / release-of-1.26.3-and-1.26.4

github.com / go-gitea/gitea/pull/38151

github.com / go-gitea/gitea/releases/tag/v1.26.3

github.com / go-gitea/gitea/security/advisories/GHSA-f75j-4cw6-rmx4