Which products and versions are affected by CVE-2026-20896?

Affected: code.gitea.io/gitea (go); Gitea Open Source Git Server. The full list is in the CVE brief.

Is CVE-2026-20896 being exploited in the wild?

It is exploited in the wild, listed in Industry KEV feed since Jul 6, 2026.

Is CVE-2026-20896 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2026-20896?

Public exploit code is available.

Is there a fix for CVE-2026-20896?

Fixed versions are available, including code.gitea.io/gitea 1.26.3.

How urgently should CVE-2026-20896 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2026-20896

CriticalExploitedPublic exploit

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.

Published Jul 3, 2026 · Updated Aug 12, 2026 · Also known as GHSA-f75j-4cw6-rmx4, GO-2026-6051

Key Facts

Patch immediately

CVE-2026-20896 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting code.gitea.io/gitea (go), Gitea Open Source Git Server.
It is exploited in the wild, listed in Industry KEV feed since Jul 6, 2026. Public exploit code is available.
EPSS estimates a 2.8% probability of exploitation in the next 30 days.
Fixed versions are available, including code.gitea.io/gitea 1.26.3.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

9.8

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

EPSS (30-day exploit likelihood)

2.8%

Higher than 86.0% of all scored CVEs

Exploited in the wild

Yes

1 catalog listing

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2026-20896 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
Industry KEV feed	Jul 6, 2026	n/a	Not reported

Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Affected Products

2 affected entries in total

Product	Affected versions	Fixed in
code.gitea.io/giteago	See advisory	1.26.3
Gitea Open Source Git Server	See advisory	n/a

Patched Releases

code.gitea.io/gitea

1.26.3

Timeline

Publicly disclosed
Jul 3, 2026
Added to Industry KEV feed
Jul 6, 2026
Last updated
Aug 12, 2026

Weakness Type

CWE-284 Improper Access Control

References

9 more references in the full CVE brief

FAQ

Common Questions.

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.
Affected: code.gitea.io/gitea (go); Gitea Open Source Git Server. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Jul 6, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including code.gitea.io/gitea 1.26.3.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2026-20896 Running On Your Attack Surface?

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