Post Grid Master WordPress Plugin Reflected Cross-Site Scripting Vulnerability

A reflected cross-site scripting vulnerability has been identified in the Post Grid Master plugin for WordPress, affecting all versions up to and including 3.4.13. The issue arises from inadequate input sanitization and output escaping, allowing unauthenticated attackers to inject arbitrary web scripts. These scripts could be executed on pages if a user is tricked into clicking a link.

Impact

Exploitation of this vulnerability allows for reflected cross-site scripting, where an attacker can inject malicious scripts that are executed in the context of the user's browser.

Reproduction

To reproduce this vulnerability, send a POST request to wp-admin/admin-ajax.php with the action 'asr_filter_posts'. Include a payload in the argsArray['read_more_text'] parameter, such as a script tag with JavaScript code, like an alert. The injected script will execute if the user clicks on a link that triggers the action.

Remediation

No known patch is available. It is recommended to uninstall the affected plugin and find a replacement.