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

Quick assessment

Affected
mailgun Mailgun for WordPress
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 中的 Mailgun 插件（版本 2.2.0 及更早版本）存在服务器端请求伪造（SSRF）漏洞，该漏洞源于路径遍历问题。此漏洞是由于 add_list() 函数中缺乏足够的输入验证所致：该函数接收来自 $_POST['addresses'] 的用户可控数组键，仅通过 sanitize_text_field() 进行简单过滤，未能有效阻止恶意路径构造。因此，未经身份认证的攻击者可利用该漏洞，借助 WordPress 站点所配置的 Mailgun API 密钥，向任意 Mailgun API 端点发

CVSS 9.8 · Critical EPSS 0.53% · P43

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
mailgun Mailgun for WordPress ≤ 2.2.0 affected
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I. Basic Information for CVE-2026-78003

Vulnerability Information
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Vulnerability Title
Mailgun for WordPress <= 2.2.0 - Unauthenticated Server-Side Request Forgery (SSRF) via 'addresses' Array Keys
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
mailgun Mailgun for WordPress 0 ~ 2.2.0 -

II. Public POCs for CVE-2026-78003

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III. Intelligence Information for CVE-2026-78003

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Patches & Fixes for CVE-2026-78003 (5)

Vendor Advisories for CVE-2026-78003 (1)

Vendor Pages for CVE-2026-78003 (1)

IV. Related Vulnerabilities

Same product: Mailgun for WordPress
Same weakness: CWE-918

V. Comments for CVE-2026-78003

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