Executive Summary

This vulnerability exists in Gogs, an open source self-hosted Git service, prior to version 0.14.3. It is an open redirect vulnerability where attacker-controlled redirect_to parameters can bypass validation checks. The validation function, IsSameSite, only inspects the first two characters of the URL string and fails to properly handle directory traversal sequences followed by backslashes. This allows attackers to redirect users to arbitrary external sites.

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Impact Analysis

This vulnerability can impact users by allowing attackers to redirect them to malicious external websites through manipulated redirect parameters. Such redirections can be used for phishing attacks, malware distribution, or other malicious activities that exploit user trust in the original site.

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Mitigation Strategies

To mitigate this vulnerability, you should upgrade Gogs to version 0.14.3 or later, where the open redirect issue has been fixed.

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