CVE-2025-11876: Jbrinley Mailgun Subscriptions

Medium severity, CVSS 6.4. EPSS: 0.2% chance of exploitation in the next 30 days.

The Mailgun Subscriptions plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'mailgun_subscription_form' shortcode in all versions up to, and including, 1.3.1 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Affected products

• Jbrinley Mailgun Subscriptions: up to and including 1.3.1

Published 2025-12-12. Last modified 2026-10-07.