CVE-2026-20706 in Gitea
Summary
by MITRE • 07/04/2026
Gitea versions up to and including 1.26.1 allow repository archive downloads to bypass token scope checks on the web archive download endpoint.
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Analysis
by VulDB Data Team • 07/04/2026
This vulnerability in Gitea versions up to and including 1.26.1 represents a critical access control flaw that undermines the security model of the platform's authentication system. The issue specifically affects the web archive download endpoint which is designed to restrict repository archive downloads based on token scope permissions. When a user accesses this endpoint with an authentication token, the system should verify that the token has appropriate permissions to download archives from the requested repository. However, due to improper validation logic in the authorization checks, malicious actors can bypass these security controls and download repository archives without having the required scope permissions.
The technical flaw stems from inadequate input validation and access control enforcement within the archive download functionality. When a request is made to download a repository archive through the web interface, the system should cross-reference the provided authentication token against the repository's permission model and the token's granted scopes. The vulnerability occurs because the scope checking mechanism fails to properly validate that the token possesses the necessary permissions for archive operations, allowing unauthorized downloads regardless of token capabilities.
The operational impact of this vulnerability is significant as it enables attackers to extract complete repository contents without proper authorization. This bypass allows malicious users to download source code, configuration files, documentation, and potentially sensitive information contained within repositories. The risk extends beyond simple code exposure since repositories often contain secrets, credentials, or proprietary information that could be exploited in subsequent attacks. Attackers could leverage this vulnerability to gain insights into development processes, identify security weaknesses, or extract intellectual property.
Organizations using Gitea versions affected by this vulnerability should immediately implement mitigations including updating to version 1.26.2 or later where the issue has been patched. Administrators should also review access control policies and ensure that authentication tokens are properly scoped to minimize potential damage. The vulnerability aligns with CWE-284 which addresses improper access control, and could potentially be categorized under ATT&CK technique T1566 for credential access through exploitation of vulnerabilities. Additional defensive measures include implementing network-level restrictions on archive download endpoints, monitoring for unusual download patterns, and conducting regular security audits of authentication mechanisms to ensure proper enforcement of access controls.
This type of vulnerability demonstrates the critical importance of robust authorization checking in web applications, particularly when dealing with sensitive data operations such as file downloads and repository access. The flaw highlights how seemingly minor issues in access control logic can lead to substantial security breaches, emphasizing the need for comprehensive testing of authentication mechanisms and proper adherence to security best practices throughout the software development lifecycle.