CVE-2026-78003 json
Mailgun for WordPress <= 2.2.0 - Unauthenticated Server-Side Request Forgery (SSRF) via 'addresses' Array Keys
published 2026-08-22 2 mo ago modified 2026-10-12 27 d ago also EUVD-2026-64242
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 56%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 2 mo ago
Exploit prediction
0.79% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- mailgun Mailgun for WordPress
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/110e888d-69fc-4682-b908-2b62288c5227?source=cve
- plugins.trac.wordpress.org /browser/mailgun/trunk/mailgun.php#L557
- plugins.trac.wordpress.org /browser/mailgun/trunk/mailgun.php#L259
- plugins.trac.wordpress.org /browser/mailgun/tags/2.1.10/mailgun.php#L259
- plugins.trac.wordpress.org /browser/mailgun/trunk/mailgun.php#L323
- plugins.trac.wordpress.org /browser/mailgun/tags/2.1.10/mailgun.php#L323
- plugins.trac.wordpress.org /browser/mailgun/trunk/mailgun.php#L331
- plugins.trac.wordpress.org /browser/mailgun/tags/2.1.10/mailgun.php#L331
- plugins.trac.wordpress.org /browser/mailgun/tags/2.1.10/mailgun.php#L557
Sources
- CVE List CVE-2026-78003
- NVD CVE-2026-78003
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.