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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-78003
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-22 09:16:53 UTC
Updated2026-08-22 09:16:53 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-918 | CWE-918 CWE-918 Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mailgun Mailgun For WordPress affected 2.2.0 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/mailgun/tags/2.1.10/mailgun.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/mailgun/tags/2.1.10/mailgun.php [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/110e888d-69fc-4682-b908-2b622... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/mailgun/trunk/mailgun.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/mailgun/trunk/mailgun.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/mailgun/trunk/mailgun.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/mailgun/tags/2.1.10/mailgun.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/mailgun/trunk/mailgun.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/mailgun/tags/2.1.10/mailgun.php [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Osvaldo Noe Gonzalez Del Rio (Os) (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-08-21T00:00:00.000ZDisclosed

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