Click to Chat WordPress Plugin Stored Cross-Site Scripting Vulnerability

A stored cross-site scripting vulnerability has been identified in the Click to Chat plugin for WordPress, affecting all versions through 4.22. The issue arises from insufficient input sanitization and output escaping, allowing authenticated attackers with Contributor-level access or higher to inject arbitrary web scripts. These scripts are executed when a user accesses the affected page.

Impact

Exploitation of this vulnerability allows for stored cross-site scripting, where injected scripts are executed in the context of the user viewing the page.

Reproduction

The vulnerability can be reproduced by an authenticated user with Contributor-level access or higher. Inject a script into the 'data-no_number' parameter, which is not properly sanitized or escaped. Once the script is injected, it will execute when the page is accessed.

Remediation

Users are advised to update the Click to Chat WordPress plugin to version 4.23 or later, where this vulnerability has been patched.