CVE-2026-96376 in Cloud
Summary
by MITRE • 10/22/2026
Improper Neutralization of Special Elements used in an OS Command ("OS Command Injection") vulnerability in Drupal Cloud allows OS Command Injection. This issue affects Cloud versions: from 0.0.0 to 7.0.1.
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Analysis
by VulDB Data Team • 10/22/2026
The identified security flaw represents a critical instance of Improper Neutralization of Special Elements used in an Operating System command, commonly referred to as OS Command Injection or CWE-78. This vulnerability resides within the Drupal Cloud module, specifically affecting versions ranging from 0.0.0 up through and including version 7.0.1. The core technical deficiency lies in the application's failure to adequately sanitize user-supplied input before it is passed directly to underlying operating system commands. When an attacker provides maliciously crafted data that includes shell metacharacters or command separators, the vulnerable script interprets these elements as part of the executable instruction set rather than as literal string data. This lack of proper validation allows for the arbitrary execution of OS-level commands with the privileges granted to the web server process, fundamentally breaking the isolation between the application layer and the host operating system.
From an operational perspective, the impact of this vulnerability is severe and potentially catastrophic for any infrastructure relying on the affected Drupal Cloud module. An attacker who successfully exploits this flaw can achieve remote code execution without authentication in many configurations, or with minimal privileges if authenticated access is required but easily obtained. The consequences extend beyond simple data exposure; they include complete compromise of the underlying server. Attackers may install backdoors, create new administrative accounts, exfiltrate sensitive database contents, pivot to other systems within the network, or deploy ransomware and cryptominers. Because Drupal modules often run with web-server level permissions, which can sometimes be escalated via kernel exploits or misconfigured services, the blast radius of this single injection point is significant. The vulnerability aligns with MITRE ATT&CK technique T1059, specifically sub-technique 008 for Command and Scripting Interpreter: Unix Shell Commands, highlighting its relevance to modern threat intelligence frameworks that track adversary behaviors related to initial access and execution phases.
The root cause of this issue is a classic input validation failure where the developer assumed user input would be benign or relied on insufficient filtering mechanisms such as basic string replacement rather than robust allow-listing strategies. In secure software development, any data originating from an untrusted source that interacts with system-level APIs must undergo rigorous sanitization. The absence of strict type checking and parameterized execution methods in the affected code path created a direct conduit for command injection. This is particularly dangerous because OS commands often have broad permissions to read files, modify configurations, or execute network requests, making them high-value targets for exploitation compared to SQL injection which primarily affects data integrity within database structures.
To mitigate this vulnerability and prevent future occurrences, immediate remediation requires upgrading the Drupal Cloud module to a version where this flaw has been patched by the maintainers. If an upgrade is not immediately feasible due to compatibility constraints with other site components, temporary workarounds must be implemented at the web server or application layer. These include implementing strict input validation that rejects any characters associated with shell commands such as semicolons, ampersands, pipes, and backticks unless they are explicitly required for legitimate functionality which should then be handled via safe API calls rather than direct system execution. Additionally, deploying a Web Application Firewall can provide a layer of defense by detecting and blocking known command injection patterns in HTTP requests. Long-term mitigation involves adopting secure coding practices that prioritize the use of language-specific functions designed to handle external input safely, avoiding direct invocation of operating system shells whenever possible, and conducting regular code reviews focused on identifying potential injection points across all user-facing inputs.