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CVE-2026-1355— Missing Authorization Check in GitHub Enterprise Server Allows Unauthorized Uploads to Repository Migration Exports

Quick assessment

Affected
GitHub Enterprise Server
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.

GitHub Enterprise Server是美国GitHub开源的一个应用软件。提供一个将自己的GitHub实例设置为虚拟设备，从而提供可扩展，易于管理的平台。 GitHub Enterprise Server 3.20之前版本存在安全漏洞，该漏洞源于仓库迁移上传端点缺少授权检查，可能导致攻击者上传未经授权的内容到其他用户的仓库迁移导出。

AI Predicted 7.5 Difficulty: Easy EPSS 0.40% · P32
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I. Basic Information for CVE-2026-1355

Vulnerability Information
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Vulnerability Title
Missing Authorization Check in GitHub Enterprise Server Allows Unauthorized Uploads to Repository Migration Exports
Source: CVE Program / CVE List V5
Vulnerability Description
A Missing Authorization vulnerability was identified in GitHub Enterprise Server that allowed an attacker to upload unauthorized content to another user’s repository migration export due to a missing authorization check in the repository migration upload endpoint. By supplying the migration identifier, an attacker could overwrite or replace a victim’s migration archive, potentially causing victims to download attacker-controlled repository data during migration restores or automated imports. An attacker would require authentication to the victim's GitHub Enterprise Server instance. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.20 and was fixed in versions 3.19.2, 3.18.5, 3.17.11, 3.16.14, 3.15.18, 3.14.23. This vulnerability was reported via the GitHub Bug Bounty program.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
GitHub Enterprise Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitHub Enterprise Server是美国GitHub开源的一个应用软件。提供一个将自己的GitHub实例设置为虚拟设备，从而提供可扩展，易于管理的平台。 GitHub Enterprise Server 3.20之前版本存在安全漏洞，该漏洞源于仓库迁移上传端点缺少授权检查，可能导致攻击者上传未经授权的内容到其他用户的仓库迁移导出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GitHub Enterprise Server 3.19.0 ~ 3.19.1 -

II. Public POCs for CVE-2026-1355

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III. Intelligence Information for CVE-2026-1355

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Vendor Pages for CVE-2026-1355 (6)

Same Patch Batch · GitHub · 2026-02-18 · 3 CVEs total

CVE-2026-1999 Incorrect Authorization vulnerability was identified in GitHub Enterprise Server that allo
CVE-2026-0573 Improper Handling of HTTP Redirects vulnerability was identified in GitHub Enterprise Serv

IV. Related Vulnerabilities

Same product: Enterprise Server
Same vendor: GitHub
Same weakness: CWE-862

V. Comments for CVE-2026-1355

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