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CVE-2026-96404— Gitea installer authentication bypass for existing accounts

Quick assessment

Affected
Gitea Gitea
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

当 Gitea 的 Web 安装程序可访问一个已包含用户（例如在将 重置为 后）的数据库时，如果在安装表单中提交的管理员用户名与现有账户匹配，系统会在未验证该账户密码的情况下为其建立已认证的会话。如果该账户是管理员，则此会话将授予完全的管理员权限，包括修改该账户的密码。对于仅包含单个用户的数据库，系统甚至不需要重新安装确认步骤。

AI Predicted 9.8 Difficulty: Easy

Affected Version Matrix 1

VendorProduct Version RangeStatus
Gitea Gitea ≤ 1.27.3 affected
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I. Basic Information for CVE-2026-96404

Vulnerability Information
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Vulnerability Title
Gitea installer authentication bypass for existing accounts
Source: CVE Program / CVE List V5
Vulnerability Description
When Gitea's web installer is reachable against a database that already contains users, such as after `INSTALL_LOCK` has been reset to `false`, submitting the install form with an administrator username matching an existing account issued an authenticated session for that account without verifying its password. If the account is an administrator, the session grants full administrative access, including changing the account's password. Databases with a single user also did not require the reinstall confirmation.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Gitea Gitea 0 ~ 1.27.3 -

II. Public POCs for CVE-2026-96404

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III. Intelligence Information for CVE-2026-96404

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Other References for CVE-2026-96404 (4)

Same Patch Batch · Gitea · 2026-10-06 · 21 CVEs total

CVE-2026-104636 Gitea SSRF through Git HTTP redirects in mirrors and fetches
CVE-2026-73278 Gitea WebAuthn bypass during OAuth and OIDC sign-in
CVE-2026-79960 Gitea deploy key pushes acting as the repository owner
CVE-2026-70357 Gitea repository migration SSRF through DNS rebinding
CVE-2026-96580 Gitea Actions memory exhaustion through large static matrices
CVE-2026-96589 Gitea private repository access retained after rejected transfer
CVE-2026-96400 Gitea migration SSRF to reserved addresses through ALLOWED_DOMAINS
CVE-2026-96399 Gitea denial of service through external issue tracker patterns
CVE-2026-104626 Gitea fork workflow job revival through later approval
CVE-2026-104632 Gitea fork workflow approval bypass through cancel and rerun
CVE-2026-94205 Gitea fork workflow approval bypass through maintainer-triggered events
CVE-2026-101027 Gitea migration SSRF through ALLOWED_DOMAINS address check bypass
CVE-2026-101029 Gitea migration and pull mirror SSRF through multi-answer DNS
CVE-2026-95106 Gitea review and execution mismatch through duplicate tree entries
CVE-2026-95112 Gitea issue reference parsing CPU exhaustion
CVE-2026-89430 Gitea push mirror SSRF and forced writes to internal Git hosts
CVE-2026-103504 Gitea API team demotion not applied to unit permissions
CVE-2026-103667 Gitea container registry stored XSS through blob media type
CVE-2026-103059 Gitea built-in SSH server authentication bypass through key case folding
CVE-2026-103670 Gitea trusted workflow cancellation by unapproved fork runs

IV. Related Vulnerabilities

Same product: Gitea
Same vendor: Gitea

V. Comments for CVE-2026-96404

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