Stored Cross-Site Scripting in Mailgun Subscriptions Plugin for WordPress

CVE-2025-11876

What is CVE-2025-11876?

The Mailgun Subscriptions plugin for WordPress is susceptible to Stored Cross-Site Scripting (XSS) through its 'mailgun_subscription_form' shortcode. This vulnerability arises from inadequate input sanitization and output escaping of user-supplied attributes. Authenticated attackers with contributor-level permissions can exploit this flaw to inject arbitrary scripts into webpages. These scripts can be executed when users access the compromised pages, posing a significant security risk to website visitors and potentially leading to unauthorized access and data breaches.

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