← Vulnerability feed

Vulnerability record · CVE-2026-78003 · published 22 August 2026

CVE-2026-78003: Server-side request forgery (SSRF) vulnerability

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.

9.8 CVSS 3.1 Critical EPSS 0.79% · top 45.5% CWE-918 · Server-side request forgery (SSRF) Deferred
9.8CVSS 3.1 base score
0.79%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
9References
25 Aug 2026Last modified by NVD

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.

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

References

LinkTags
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

Track CVE-2026-78003 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2026-83548SonicWall SMA1000 pre-auth SSRF via alternate access pathThe SMA1000 Appliance Work Place interface exposes an unintended alternate access path that allows server-side request forgery before authentication.…KEVEPSS 8.8%analysed10.0CVE-2026-49869Kestra OSS auth bypass via path suffix match enables RCEKestra OSS AuthenticationFilter whitelists the public config endpoint using request.getPath().endsWith("/configs"), a suffix match instead of an exac…KEVEPSS 2.1%analysed9.3CVE-2026-64849MLflow unauthenticated webhook test endpoint SSRF via redirectMLflow before 3.15.0 validates the webhook URL only on the original request, while the delivery code follows redirects and re-resolves the hostname w…KEVEPSS 9.8%analysed10.0CVE-2026-15409SonicWall SMA1000 Work Place SSRF allows unauthenticated requestsThe SMA1000 Appliance Work Place interface contains a server-side request forgery flaw (CWE-918) that lets the appliance be induced to make requests …KEVEPSS 6.8%analysed8.6CVE-2026-20230Cisco Unified CM SSRF enables file write and root escalationCisco Unified Communications Manager and Unified CM SME fail to properly validate input for specific HTTP requests, allowing server-side request forg…KEVEPSS 88%analysed7.5CVE-2021-22054VMware Workspace ONE UEM console unauthenticated SSRFThe Workspace ONE UEM console contains a server-side request forgery flaw in versions 20.0.8 before 20.0.8.37, 20.11.0 before 20.11.0.40, 21.2.0 befo…KEVEPSS 100%analysed9.8CVE-2021-22175GitLab unauthenticated SSRF via internal webhook requestsGitLab is vulnerable to server-side request forgery when requests to the internal network for webhooks are enabled. The flaw affects all versions sta…KEVEPSS 53%analysed9.8CVE-2020-7796Zimbra Collaboration Suite WebEx zimlet SSRFZimbra Collaboration Suite before 8.8.15 Patch 7 is vulnerable to server-side request forgery when the WebEx zimlet is installed and its JSP is enabl…KEVEPSS 84%analysed

Source: NIST National Vulnerability Database (record CVE-2026-78003), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.