CVE-2026-39440
Published: 23 April 2026
Summary
CVE-2026-39440 is a critical-severity Code Injection (CWE-94) vulnerability. Its CVSS base score is 9.9 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 28.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2026-39440 is an Improper Control of Generation of Code ('Code Injection') vulnerability, classified under CWE-94, in the FunnelFormsPro WordPress plugin from Funnelforms LLC. It allows Remote Code Inclusion and affects all versions of the plugin from n/a through 3.8.1. Published on 2026-04-23, the vulnerability carries a CVSS v3.1 base score of 9.9 (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H), marking it as critical severity.
A remote attacker with low privileges, such as an authenticated WordPress user, can exploit this vulnerability over the network with low complexity and no user interaction required. Exploitation changes scope and achieves high impacts across confidentiality, integrity, and availability, enabling remote code execution on the affected system.
The primary advisory from Patchstack, available at https://patchstack.com/database/wordpress/plugin/funnelforms-pro/vulnerability/wordpress-funnelformspro-plugin-3-8-1-remote-code-execution-rce-vulnerability?_s_id=cve, documents this remote code execution issue in FunnelFormsPro 3.8.1. Practitioners should review this reference for details on patches and mitigation steps.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-25220
Vulnerability details
Improper Control of Generation of Code ('Code Injection') vulnerability in Funnelforms LLC FunnelFormsPro allows Remote Code Inclusion.This issue affects FunnelFormsPro: from n/a through 3.8.1.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
The CVE describes a remote code execution vulnerability (CWE-94 code injection) in a public-facing WordPress plugin, directly enabling T1190: Exploit Public-Facing Application to achieve RCE.
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly mitigates the code injection vulnerability by validating and sanitizing user inputs to FunnelFormsPro, preventing remote code inclusion.
Requires timely identification, testing, and installation of patches for the specific code injection flaw in FunnelFormsPro through version 3.8.1.
Enforces least privilege to restrict low-privileged authenticated WordPress users from accessing or exploiting the vulnerable plugin functionality leading to RCE.