CVE-2026-16051 in wpmudev-updates Plugin
Summary
by MITRE • 08/12/2026
The wpmudev-updates WordPress plugin before 5.0.1 does not verify the integrity of the packages installed through its remote management interface, nor protect those requests against replay, allowing an attacker able to obtain or replay a valid signed management request to install and execute arbitrary code (remote code execution).
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Analysis
by VulDB Data Team • 08/12/2026
The wpmudev-updates WordPress plugin vulnerability represents a critical security flaw that undermines the integrity of plugin management operations within WordPress environments. This issue affects versions prior to 5.0.1 and stems from insufficient validation mechanisms that fail to verify package integrity during installation processes. The vulnerability operates through a remote code execution vector that allows attackers to manipulate legitimate signed requests for malicious purposes.
The technical implementation of this flaw resides in the plugin's failure to implement proper cryptographic verification procedures for downloaded packages. When administrators or automated systems initiate package installations through the remote management interface, the system does not validate the authenticity or integrity of the downloaded files against known good checksums or digital signatures. This absence of verification creates an opportunity for attackers to substitute malicious code within legitimate update packages without detection.
The operational impact of this vulnerability extends beyond simple code execution capabilities to encompass complete system compromise potential. Attackers who can intercept or replay valid signed management requests gain the ability to install arbitrary code, potentially escalating privileges and establishing persistent access points within target environments. The vulnerability is particularly dangerous because it leverages existing legitimate communication channels, making malicious activities appear as normal administrative operations.
Security implications of this flaw align with CWE-347, which addresses improper verification of cryptographic signatures, and can be categorized under ATT&CK technique T1059 for execution through command and scripting interpreters. The vulnerability demonstrates poor implementation of security controls that should have been in place to protect against man-in-the-middle attacks and credential compromise scenarios. Organizations using affected versions face significant risk exposure when attackers gain access to valid management credentials or can intercept network traffic containing signed requests.
Mitigation strategies should focus on immediate remediation through plugin version updates to 5.0.1 or later, which implement proper package integrity verification mechanisms. Network monitoring solutions should be enhanced to detect unusual patterns in update requests, particularly those involving unexpected package installations. Organizations should also implement additional security controls including network segmentation, strict access controls for management interfaces, and comprehensive audit logging of all plugin installation activities. The vulnerability highlights the importance of implementing defense-in-depth strategies that protect against multiple attack vectors simultaneously rather than relying on single security controls.