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Vulnerability record · CVE-2026-20896 · published 3 July 2026

CVE-2026-20896: Improper access control vulnerability

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.

9.8 CVSS 3.1 Critical EPSS 2.8% · top 14.3% CWE-284 · Improper access control Deferred
9.8CVSS 3.1 base score
2.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
7 Jul 2026Last modified by NVD

Description

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.

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

References

LinkTags
https://blog.gitea.com/release-of-1.26.3-and-1.26.4/
https://github.com/go-gitea/gitea/pull/38151
https://github.com/go-gitea/gitea/releases/tag/v1.26.3
https://github.com/go-gitea/gitea/security/advisories/GHSA-f75j-4cw6-rmx4
https://github.com/go-gitea/gitea/security/advisories/GHSA-f75j-4cw6-rmx4

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-20896), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.