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CRITICAL

CVE-2026-20896

CVSS v3

9.8

CRITICAL

EPSS Score

2.8 %

exploit probability, as of 2026-09-25

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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.

Technical details

Published
2026-07-03
Last Modified
2026-07-03
GitHub Advisory
GHSA-f75j-4cw6-rmx4

Frequently asked questions

What is CVE-2026-20896?

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.

Is CVE-2026-20896 actively exploited?

Active exploitation of CVE-2026-20896 has not been confirmed. Its EPSS score was 2.8% on 2026-09-25, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-20896?

CVE-2026-20896 has a CVSS v3 base score of 9.8 (CRITICAL severity).

Is CVE-2026-20896 affecting your environment?

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