Executive Summary

This vulnerability is a Cross-Site Request Forgery (CSRF) issue in the User Sync – Remote User Sync plugin for WordPress, affecting all versions up to and including 1.0.2. It occurs because the plugin's mo_user_sync_form_handler() function lacks proper nonce validation, allowing an attacker to trick a site administrator into performing an action, such as clicking a malicious link, which can deactivate the plugin without the administrator's intent.

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Impact Analysis

An attacker can exploit this vulnerability to deactivate the User Sync plugin on a WordPress site by tricking an administrator into clicking a malicious link. This could disrupt user synchronization functionality, potentially affecting site operations that rely on this plugin.

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Mitigation Strategies

To mitigate this vulnerability, update the User Sync – Remote User Sync plugin to a version later than 1.0.2 where the nonce validation issue is fixed. Additionally, avoid clicking on suspicious links and ensure that site administrators are aware of the risk of Cross-Site Request Forgery attacks targeting this plugin.

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