Social Media Auto Publish Reflected Cross-Site Scripting Vulnerability

A reflected cross-site scripting vulnerability has been identified in the Social Media Auto Publish plugin for WordPress, affecting all versions through 3.6.5. The issue arises from inadequate input sanitization and output escaping, allowing unauthenticated attackers to inject arbitrary web scripts via the PostMessage parameter. These scripts could be executed on pages if the attacker successfully persuades a user to perform a specific action, such as 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, an unauthenticated user can send a request that includes a crafted PostMessage parameter with malicious script content. If the target user clicks on a link that triggers the PostMessage event, the injected script will execute in their browser.

Remediation

Users are advised to update the Social Media Auto Publish plugin to version 3.6.6 or later.