CVE-2026-27180 in MajorDoMo
Summary
by MITRE • 02/19/2026
MajorDoMo (aka Major Domestic Module) is vulnerable to unauthenticated remote code execution through supply chain compromise via update URL poisoning. The saverestore module exposes its admin() method through the /objects/?module=saverestore endpoint without authentication because it uses gr('mode') (which reads directly from $_REQUEST) instead of the framework's $this->mode. An attacker can poison the system update URL via the auto_update_settings mode handler, then trigger the force_update handler to initiate the update chain. The autoUpdateSystem() method fetches an Atom feed from the attacker-controlled URL with trivial validation, downloads a tarball via curl with TLS verification disabled (CURLOPT_SSL_VERIFYPEER set to FALSE), extracts it using exec('tar xzvf ...'), and copies all extracted files to the document root using copyTree(). This allows an attacker to deploy arbitrary PHP files, including webshells, to the webroot with two GET requests.
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Analysis
by VulDB Data Team • 02/21/2026
The vulnerability CVE-2026-27180 represents a critical supply chain compromise in MajorDoMo, a popular home automation platform that suffers from a severe unauthenticated remote code execution flaw. This vulnerability stems from a combination of poor input validation, insecure coding practices, and inadequate security controls within the system's update mechanism. The attack vector exploits the saverestore module's administrative functionality, which is exposed through the unauthenticated /objects/?module=saverestore endpoint, creating a direct pathway for malicious actors to compromise the system without requiring any credentials.
The technical flaw manifests through the improper handling of request parameters within the framework's architecture. The system utilizes gr('mode') function which directly reads from the global $_REQUEST superglobal instead of employing the proper framework method $this->mode, creating a dangerous exposure point where attacker-controlled input can bypass authentication mechanisms entirely. This design flaw allows an attacker to manipulate the auto_update_settings mode handler through the update URL poisoning technique, effectively compromising the system's update chain from within. The vulnerability operates through a multi-stage attack process that begins with URL poisoning and culminates in full system compromise.
The operational impact of this vulnerability is devastating for organizations and individuals using MajorDoMo systems, as it provides attackers with complete control over the affected infrastructure. The autoUpdateSystem() method demonstrates particularly concerning security practices, including the fetching of Atom feeds from attacker-controlled URLs with minimal validation, followed by the download of tarball files using curl with TLS verification disabled. The CURLOPT_SSL_VERIFYPEER flag set to FALSE creates a significant security gap that allows man-in-the-middle attacks and enables the download of malicious payloads from compromised sources. The subsequent execution of tar extraction commands through exec() function combined with the copyTree() method for deploying files to the document root provides attackers with the capability to install arbitrary PHP code, including webshells, with minimal effort.
This vulnerability aligns with multiple CWE classifications including CWE-20 Improper Input Validation, CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component, and CWE-94 Improper Control of Generation of Code ('Code Injection'). From an ATT&CK framework perspective, this vulnerability maps to T1059 Command and Scripting Interpreter and T1078 Valid Accounts, as it enables attackers to execute arbitrary code and potentially establish persistent access. The supply chain compromise aspect of this vulnerability also relates to T1195 Supply Chain Compromise, as the attack targets the legitimate update mechanism to deliver malicious payloads. The exploitation requires only two simple GET requests, making it particularly dangerous for widespread deployment and automated attacks, potentially affecting numerous systems that rely on the platform's update functionality.
Mitigation strategies must address both immediate and long-term security concerns. Organizations should immediately implement network-level restrictions to prevent access to the vulnerable endpoint and disable automatic update functionality until patches are applied. The framework should be updated to properly utilize the $this->mode method instead of direct $_REQUEST access, implement robust input validation for all parameters, and enforce mandatory TLS verification for all external communications. Additionally, the system should employ proper authentication checks for all administrative endpoints and implement secure update mechanisms that validate all downloaded content through cryptographic signatures. Security monitoring should be enhanced to detect unusual update patterns and unauthorized file deployments, while regular security audits should verify that all modules properly implement authentication and authorization controls to prevent similar vulnerabilities from emerging in the future.