MailUp Auto Subscription WordPress Plugin Cross-Site Request Forgery Vulnerability

A Cross-Site Request Forgery (CSRF) vulnerability has been identified in the MailUp Auto Subscription plugin for WordPress, affecting all versions through 1.1.0. The vulnerability arises from inadequate nonce validation in the 'mas_options' function, allowing unauthenticated attackers to manipulate settings and inject malicious scripts. Exploitation requires tricking a site administrator into clicking a link that initiates the forged request.

Impact

Exploitation of this vulnerability could lead to unauthorized changes in plugin settings and the injection of malicious scripts, which could be executed in the context of the user.

Reproduction

To reproduce this vulnerability, an attacker must exploit the missing nonce validation by sending a forged request to the 'mas_options' function. This can be done by tricking an administrator into clicking a link that includes the malicious payload, which could be achieved through social engineering or other means.

Remediation

Users are advised to update the MailUp Auto Subscription plugin to version 1.2.0 or later, where this vulnerability has been patched.