CVE-2026-78003
Mailgun for WordPress <= 2.2.0 - Unauthenticated Server-Side Request Forgery (SSRF) via 'addresses' Array Keys
- State
- Published
- Severity
- 9.8 Critical
- Published
- Aug 22, 2026
- Updated
- Aug 25, 2026
- Reserved
- Aug 21, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | Wordfence |
Weaknesses
- CWE-918 Server-Side Request Forgery (SSRF)
Affected Products
| Product | Versions |
|---|---|
Mailgun for WordPressmailgun |
|
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/110e888d-69fc-4682-b908-2b62288c5227?source=cve
- https://plugins.trac.wordpress.org/browser/mailgun/trunk/mailgun.php#L557
- https://plugins.trac.wordpress.org/browser/mailgun/trunk/mailgun.php#L259
- https://plugins.trac.wordpress.org/browser/mailgun/tags/2.1.10/mailgun.php#L259
- https://plugins.trac.wordpress.org/browser/mailgun/trunk/mailgun.php#L323
- https://plugins.trac.wordpress.org/browser/mailgun/tags/2.1.10/mailgun.php#L323
- https://plugins.trac.wordpress.org/browser/mailgun/trunk/mailgun.php#L331
- 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
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