Stored XSS in WP Event Solution WordPress Plugin

Executive Summary

This is a Stored Cross-Site Scripting (XSS) vulnerability in the WP Event Solution WordPress plugin. It allows attackers to inject malicious scripts into web pages that are stored on the server. When other users view these pages, the scripts execute in their browsers, potentially stealing data or hijacking accounts.

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Detection Guidance

To detect this vulnerability, inspect WordPress sites running WP Event Solution plugin versions 4.1.26 or below. Check for suspicious user inputs in event forms or pages that may contain script tags. Use security plugins like Wordfence or Sucuri to scan for XSS attempts. Review server logs for unusual POST requests to wp-admin/admin-ajax.php or similar endpoints.

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Impact Analysis

If exploited, attackers could steal visitor data, hijack user accounts, or perform unauthorized actions on your behalf. Successful exploitation requires a privileged user to interact with a malicious link or form submission.

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Mitigation Strategies

Immediately update the WP Event Solution plugin to version 4.1.27 or later. If updating is not possible, apply Patchstack's mitigation rule to block attacks until the update is applied. Remove or restrict access to untrusted user roles that can submit event data. Monitor for unusual activity or unauthorized changes in the plugin's files.

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