9.8

CVE-2026-20896: gitea gitea open source git server Improper Access Control

CVSS: 9.8v3.1CriticalDeferred
AliasesGHSA-f75j-4cw6-rmx4GO-2026-6051
Published 03-07-2026Last modified 07-07-2026
Open JSON

Vulnerability summary

CVE-2026-20896 is a critical (CVSS 9.8) Improper Access Control vulnerability in gitea gitea open source git server. EPSS estimates a 2.76% chance of exploitation in the next 30 days, higher than 86% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
2.76%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:21483-1

Timeline

  1. 03-07-2026
    PublishedVulnerability first disclosed.
  2. 07-07-2026
    Last modifiedVulnerability information updated.

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 metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

2.76%

Chance of exploitation in the next 30 days

Percentile

86%

Versus all other CVEs

30-day change

0.00 pp

From 2.76% on 19-09-2026

19-09-202619-10-2026
EPSS score
2.76%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Code.gitea.io1 product
  • gitea< 1.26.3
Gitea1 product

2 vendors · 2 products

References

8 links