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Exploitation reportedNot in CISA KEV yetFix available

CVE-2026-20896

Exploitation reported by one source. First attested on 2026-10-20 by GCVE · previdian.

  • Published2026-07-03
  • Fixed in1.26.3
  • WeaknessCWE-284

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-07-0321:16CVE publishedNVD
  2. 2026-10-2010:05Listed as exploited by GCVEGCVE
  3. 2026-10-2010:05Exploitation first reportedGCVE

Versions per branch

OSV
code.gitea.io/gitea
BranchAffectedFixed in
1.26< 1.26.31.26.3

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As Gitea, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Gitea Open Source Git Serverother versions: not affected
    Affected
    • ≤ 1.26.2no fix statedsemver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-07-05

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • govulncheck-vulndbopenSUSE:Leap 16.0all versions · fixed in 0.0.20260723T184607-160000.1.1

Full record on NVD

Fix

  1. Update code.gitea.io/gitea to 1.26.3

Detection

read 2026-11-01 01:02 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-07-03
Last Modified
2026-10-25
NVD status
Deferred
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?

A proof-of-concept exploit exists for CVE-2026-20896, but active exploitation has not been confirmed at this time.

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

CVE-2026-20896 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record