Unauthenticated Cross Site Scripting in Subscribe2

Executive Summary

This is an Unauthenticated Cross Site Scripting (XSS) vulnerability in the Subscribe2 WordPress plugin versions 10.46 and below. It allows attackers to inject malicious scripts into websites by tricking a privileged user into clicking a malicious link or submitting a form. The vulnerability has a CVSS score of 7.1, indicating a medium severity threat.

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Detection Guidance

To detect this XSS vulnerability in Subscribe2 <= 10.46, monitor for unusual script injections in web forms or URLs. Check browser console logs for unexpected scripts and inspect network traffic for malicious payloads. No specific commands are provided in the resources.

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Impact Analysis

Attackers could exploit this to inject malicious scripts like redirects or advertisements into your website. This could lead to defacement, stolen user data, or further compromise of your site. Successful exploitation requires a privileged user to interact with a malicious link or form.

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Compliance Impact

This vulnerability could lead to unauthorized script execution, potentially exposing user data or violating privacy requirements under GDPR or HIPAA. Compliance may be impacted if user data is compromised due to the injected scripts.

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Mitigation Strategies

Immediately update the Subscribe2 plugin to the latest version if available. If no patch exists, apply Patchstack's mitigation rule to block attacks. Disable the plugin temporarily if updates are not possible and seek assistance from a hosting provider or developer.

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