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No exploitation reported

CVE-2026-120263

Gitea OAuth2 account auto-linking takeover through the sign-up form

No exploitation reported by the sources we read.

  • Published2026-11-01
  • WeaknessCWE-287 · CWE-639

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

When `[oauth2_client].ACCOUNT_LINKING` is set to `auto` (not the default) and registration is enabled, the link-account sign-up form looked up the existing account to link by the user name or email submitted in the form instead of the identity asserted by the OAuth2 provider. An attacker with an account on a configured OAuth2 provider could submit another user's name, link their external identity to that Gitea account and be signed in as it without its password, including as an administrator. The link persisted for later sign-ins. Automatic linking now only happens when the existing account matches the provider's email or provider-derived user name; otherwise the account password is required.

Timeline

dates in UTC
  1. 2026-11-0109:47CVE publishedCNA

Versions per branch

Products declared by the CNA

As Gitea, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.

  • Giteaother versions: not affected

    package gitea.dev

    Affected
    • < 28.3.0fixed in 28.3.0semver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-01

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-120263 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-11-06
  • CISA-ADPSSVC decisionnone2026-11-06
  • CISA-ADPCVSS 3.19.82026-11-06
  • CNAweakness (CWE)CWE-287, CWE-6392026-11-01
  • FIRST EPSSEPSS score0.2 %2026-11-05

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
2026-11-01
Last Modified
2026-11-06
NVD status
Deferred

Frequently asked questions

What is CVE-2026-120263?

When `[oauth2_client].ACCOUNT_LINKING` is set to `auto` (not the default) and registration is enabled, the link-account sign-up form looked up the existing account to link by the user name or email submitted in the form instead of the identity asserted by the OAuth2 provider. An attacker with an account on a configured OAuth2 provider could submit another user's name, link their external identity to that Gitea account and be signed in as it without its password, including as an administrator. The link persisted for later sign-ins. Automatic linking now only happens when the existing account matches the provider's email or provider-derived user name; otherwise the account password is required.

Is CVE-2026-120263 actively exploited?

Active exploitation of CVE-2026-120263 has not been confirmed. Its EPSS score was 0.2% on 2026-11-05, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-120263?

CVE-2026-120263 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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