Executive Summary

CVE-2026-56332 is an open redirect vulnerability found in Capgo versions before 12.128.2. It exists in the confirm-signup endpoint where the confirmation_url parameter is not properly validated.

This flaw allows attackers to craft malicious links that redirect users to arbitrary external websites, potentially leading to phishing, credential harvesting, or malware distribution attacks.

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Impact Analysis

The vulnerability can be exploited by attackers to redirect users to malicious external sites by manipulating the confirmation_url parameter.

• Users may be exposed to phishing attacks where attackers impersonate trusted entities to steal credentials.
• There is a risk of malware distribution through the crafted malicious links.
• Credential harvesting attacks can occur, compromising user accounts and sensitive information.

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Mitigation Strategies

To mitigate this vulnerability, you should upgrade Capgo to version 12.128.2 or later, where the open redirect issue in the confirm-signup endpoint has been patched.

Avoid using or sharing links that include the confirmation_url parameter until the update is applied, as these can be manipulated for phishing or credential harvesting attacks.

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Compliance Impact

The vulnerability allows attackers to redirect users to arbitrary external websites via the confirmation_url parameter, which can be exploited for phishing and credential harvesting attacks.

Such attacks could potentially lead to unauthorized access to personal or sensitive data, which may impact compliance with standards and regulations like GDPR and HIPAA that require protection of user data and prevention of phishing or credential theft.

However, the provided information does not explicitly discuss the direct impact of this vulnerability on compliance with these standards.

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Detection Guidance

This vulnerability involves an open redirect in the confirm-signup endpoint of Capgo versions before 12.128.2, specifically through the confirmation_url parameter. Detection can focus on identifying requests to this endpoint that include suspicious or external URLs in the confirmation_url parameter.

To detect potential exploitation attempts on your network or system, you can monitor HTTP requests for the confirm-signup endpoint and inspect the confirmation_url parameter for untrusted or external domains.

Example commands to detect such attempts might include:

• Using grep on web server logs to find requests to the confirm-signup endpoint with the confirmation_url parameter: grep -i 'confirm-signup' /var/log/nginx/access.log | grep 'confirmation_url='
• Using a network packet capture tool like tshark to filter HTTP requests containing the confirmation_url parameter: tshark -Y 'http.request.uri contains "confirmation_url="' -T fields -e http.host -e http.request.uri
• Using curl or a similar tool to test the endpoint manually by sending crafted URLs and observing redirection behavior: curl -v 'https://your-capgo-instance/confirm-signup?confirmation_url=http://malicious.example.com'

Monitoring for unexpected redirects or unusual external URLs in logs or traffic can help identify exploitation attempts.

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