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CVE-2026-20912— Gitea: Cross-Repository Authorization Bypass via Release Attachment Linking Leads to Private Attachment Disclosure

Quick assessment

Affected
Gitea Gitea Open Source Git 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.

Gitea是Gitea社区的一个基于Go开发的轻量型git服务。 Gitea存在安全漏洞，该漏洞源于将附件链接到发布版本时未正确验证仓库所有权，可能导致上传到私有仓库的附件被链接到不同公共仓库的发布版本，从而被未授权用户访问。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.46% · P38

Affected Version Matrix 1

VendorProduct Version RangeStatus
Gitea Gitea Open Source Git Server ≤ 1.25.3 affected
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I. Basic Information for CVE-2026-20912

Vulnerability Information
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Vulnerability Title
Gitea: Cross-Repository Authorization Bypass via Release Attachment Linking Leads to Private Attachment Disclosure
Source: CVE Program / CVE List V5
Vulnerability Description
Gitea does not properly validate repository ownership when linking attachments to releases. An attachment uploaded to a private repository could potentially be linked to a release in a different public repository, making it accessible to unauthorized users.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Gitea 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Gitea是Gitea社区的一个基于Go开发的轻量型git服务。 Gitea存在安全漏洞，该漏洞源于将附件链接到发布版本时未正确验证仓库所有权，可能导致上传到私有仓库的附件被链接到不同公共仓库的发布版本，从而被未授权用户访问。
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)

Shenlong Deep Dive — AI Deep Analysis

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Gitea Gitea Open Source Git Server 0 ~ 1.25.3 -

II. Public POCs for CVE-2026-20912

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III. Intelligence Information for CVE-2026-20912

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Security Blog Posts for CVE-2026-20912 (1)

Same Patch Batch · Gitea · 2026-01-22 · 9 CVEs total

CVE-2026-0798 Gitea Release Email Notifications Leak Private Repository Release Details After Access Rev
CVE-2026-20883 Gitea Stopwatch API Missing Authorization Check Leads to Post-Revocation Information Discl
CVE-2026-20750 Gitea Organization Projects Cross-Organization Authorization Bypass via Project ID (IDOR)
CVE-2026-20904 Gitea: Broken access control in OpenID visibility toggle enables cross-user visibility cha
CVE-2026-20888 Gitea Pull Requests Auto-Merge: Read-Only Users Can Cancel Scheduled Auto-Merge via Web En
CVE-2026-20800 Notification API Leaks Private Repository Issue Titles After Collaborator Permission Revoc
CVE-2026-20897 Gitea Git LFS Lock Deletion Broken Access Control (Cross-Repo IDOR)
CVE-2026-20736 Gitea Web Attachment Deletion: Cross-Repository Unauthorized Deletion via Missing Repo Own

IV. Related Vulnerabilities

Same product: Gitea Open Source Git Server
Same vendor: Gitea
Same weakness: CWE-284

V. Comments for CVE-2026-20912

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