CVE-2026-78003
Medium
Elevated severity or exploit probability.
CVSS base
9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS — probability of exploitation (30 days)
0.8%
54.4th percentile
CISA KEV
Not listed
Weakness / dates
CWE-918
Published 2026-08-22 · modified 2026-08-25
Description
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.
References
- https://plugins.trac.wordpress.org/browser/mailgun/tags/2.1.10/mailgun.php#L259
- https://plugins.trac.wordpress.org/browser/mailgun/tags/2.1.10/mailgun.php#L323
- https://plugins.trac.wordpress.org/browser/mailgun/tags/2.1.10/mailgun.php#L331
- https://plugins.trac.wordpress.org/browser/mailgun/tags/2.1.10/mailgun.php#L557
- https://plugins.trac.wordpress.org/browser/mailgun/trunk/mailgun.php#L259
- https://plugins.trac.wordpress.org/browser/mailgun/trunk/mailgun.php#L323
- https://plugins.trac.wordpress.org/browser/mailgun/trunk/mailgun.php#L331
- https://plugins.trac.wordpress.org/browser/mailgun/trunk/mailgun.php#L557
- https://www.wordfence.com/threat-intel/vulnerabilities/id/110e888d-69fc-4682-b908-2b62288c5227?source=cve