Organization Membership Exposure in REST API

Executive Summary

This vulnerability affects Gitea versions 1.26.4 and earlier. It involves a REST API endpoint that exposes whether a user is a public member of a private organization. This information should remain hidden as private organizations are designed to conceal membership details.

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Detection Guidance

To detect this vulnerability, check if your Gitea instance is running version 1.26.4 or earlier. Use the command: curl -s http://your-gitea-server/api/v1/version | grep version. If the version is <=1.26.4, the system is vulnerable. Additionally, monitor API logs for unusual GET requests to /orgs/{org}/public_members/{username} endpoints.

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Impact Analysis

An attacker could exploit this to determine if a specific user is a member of a private organization. This leaks sensitive membership information, potentially revealing organizational structures or affiliations that should be confidential.

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Compliance Impact

This vulnerability could lead to non-compliance with privacy regulations like GDPR or HIPAA by exposing sensitive membership data. Unauthorized disclosure of such information may violate data protection requirements.

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Mitigation Strategies

Upgrade Gitea to version 1.27.0 or later immediately. If upgrading is not possible, restrict access to the vulnerable API endpoint by configuring firewall rules or disabling public access to private organization membership data.

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