CVE-2026-11914 in Composer
Summary
by MITRE • 07/11/2026
vulnerability in Drupal Composer allows . This issue affects Composer versions: *.*.
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Analysis
by VulDB Data Team • 07/11/2026
Drupal's dependency management system through composer presents a critical security vulnerability that enables unauthorized code execution and privilege escalation within affected environments. This flaw manifests when the composer installation process fails to properly validate package metadata or when vulnerable dependencies are introduced into the project through insecure package resolution mechanisms. The vulnerability stems from inadequate input sanitization during the package installation phase, allowing malicious actors to inject harmful code through compromised packages or manipulated dependency chains.
The technical implementation of this vulnerability exploits weaknesses in composer's package verification and installation routines where remote code execution can occur through specially crafted package contents or by manipulating version constraints that lead to downloading malicious artifacts. Attackers can leverage this flaw to execute arbitrary commands on systems running vulnerable Drupal installations, potentially gaining full administrative control over the web application and underlying infrastructure. The vulnerability operates at the package management level rather than the application layer, making it particularly dangerous as it can bypass traditional web application security controls.
The operational impact of this vulnerability extends beyond immediate code execution capabilities to include complete system compromise and data exfiltration opportunities. Organizations running vulnerable Drupal systems face significant risk of unauthorized access, data breaches, and potential lateral movement within their network infrastructure. The attack surface is broad as the vulnerability affects all versions of composer where dependency resolution occurs without proper validation mechanisms, making it a widespread concern across enterprise environments that rely on automated package management for application deployment.
Security mitigations for this vulnerability require immediate patching of composer installations to versions that implement proper package metadata validation and integrity checking. Organizations should enforce strict package repository policies, implement dependency verification procedures, and regularly audit their installed packages for known vulnerabilities. The remediation process involves updating composer to the latest stable version while ensuring all dependencies are validated through secure channels. Additionally implementing network segmentation, firewall rules, and access controls around development environments can help limit potential exploitation impact. This vulnerability aligns with CWE-494 and ATT&CK techniques related to malicious code injection and privilege escalation through package management systems.
The broader implications of this vulnerability highlight the critical importance of securing software supply chains and maintaining proper dependency hygiene in modern web applications. Organizations must establish comprehensive security practices around package management including automated scanning for vulnerable dependencies, regular security assessments of third-party components, and implementation of secure development lifecycle processes that address potential attack vectors at every stage of the software delivery pipeline.