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CVE-2026-78003: Mailgun for WordPress <= 2.2.0 - Unauthenticated Server-Side Request Forgery (SSRF) via 'addresses' Array Keys

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-22 · updated 2026-10-12
• Weakness: CWE-918

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.

Affected products

• Mailgun for WordPress: through 2.2.0

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

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