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CVE-2026-20736— Gitea Web Attachment Deletion: Cross-Repository Unauthorized Deletion via Missing Repo Ownership Check

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，该漏洞源于删除附件时未正确验证仓库上下文，可能导致用户在失去对某个仓库的访问权限后，仍可通过其可访问的其他仓库发起请求删除附件。

AI Predicted 6.5 Difficulty: Easy EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

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-2026-20736

Vulnerability Information
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Vulnerability Title
Gitea Web Attachment Deletion: Cross-Repository Unauthorized Deletion via Missing Repo Ownership Check
Source: CVE Program / CVE List V5
Vulnerability Description
Gitea does not properly verify repository context when deleting attachments. A user who previously uploaded an attachment to a repository may be able to delete it after losing access to that repository by making the request through a different repository they can access.
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，该漏洞源于删除附件时未正确验证仓库上下文，可能导致用户在失去对某个仓库的访问权限后，仍可通过其可访问的其他仓库发起请求删除附件。
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)

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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-2026-20736

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III. Intelligence Information for CVE-2026-20736

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Security Blog Posts for CVE-2026-20736 (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-2026-20912 Gitea: Cross-Repository Authorization Bypass via Release Attachment Linking Leads to Priva
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)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-20736

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