The Mailgun for WordPress plugin for WordPress is vulnerable to Server-Side Request Forgery (SSRF) via path traversal in versions up to and including 2.2.0. This is due to insufficient input validation in the add_list() function, which accepts user-controlled array keys from $_POST['addresses'], passes them through sanitize_text_field(). This makes it possible for unauthenticated attackers to make authenticated POST requests to any Mailgun API endpoint using the WordPress site's API key, including creating inbound email-forwarding routes that can intercept password reset emails, leading to administrator account takeover.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products
mailgun:mailgun for wordpress
References 9
https://plugins.trac.wordpress.org/browser/mailgun/tags/2.1.10/mailgun.php#L259
security@wordfence.com
https://plugins.trac.wordpress.org/browser/mailgun/tags/2.1.10/mailgun.php#L323
security@wordfence.com
https://plugins.trac.wordpress.org/browser/mailgun/tags/2.1.10/mailgun.php#L331
security@wordfence.com
https://plugins.trac.wordpress.org/browser/mailgun/tags/2.1.10/mailgun.php#L557
security@wordfence.com
https://plugins.trac.wordpress.org/browser/mailgun/trunk/mailgun.php#L259
security@wordfence.com
https://plugins.trac.wordpress.org/browser/mailgun/trunk/mailgun.php#L323
security@wordfence.com
https://plugins.trac.wordpress.org/browser/mailgun/trunk/mailgun.php#L331
security@wordfence.com
https://plugins.trac.wordpress.org/browser/mailgun/trunk/mailgun.php#L557
security@wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/110e888d-69fc-4682-b9…
security@wordfence.com