PHP Composer vulnerabilities allow arbitrary command execution

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April 16, 2026 at 3:09 PM

Overview

Two vulnerabilities have been identified in PHP Composer, specifically relating to its Perforce version control system driver. The vulnerabilities, known as CVE-2026-40176 and CVE-2026-40261, are due to improper input validation and insufficient escaping, which could allow attackers to execute arbitrary commands. The severity scores for these vulnerabilities are 7.8 and 8.8 respectively, indicating a significant risk. Users of PHP Composer, especially those utilizing the Perforce VCS driver, should be particularly vigilant. It's crucial for organizations to address these vulnerabilities promptly to avoid potential exploitation and ensure the safety of their software development processes.

Key Takeaways

Affected Systems: PHP Composer, Perforce VCS driver
Action Required: Users should update to the latest version of PHP Composer and ensure that the Perforce VCS driver is properly configured to mitigate these vulnerabilities.
Timeline: Newly disclosed

Original Article Summary

The vulnerabilities, CVE-2026-40176 (CVSS 7.8) and CVE-2026-40261 (CVSS 8.8), stem from improper input validation and insufficient escaping within Composer's Perforce VCS driver.

Impact

PHP Composer, Perforce VCS driver

Exploitation Status

No active exploitation has been reported at this time. However, organizations should still apply patches promptly as proof-of-concept code may exist.

Timeline

Newly disclosed

Remediation

Users should update to the latest version of PHP Composer and ensure that the Perforce VCS driver is properly configured to mitigate these vulnerabilities.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to CVE, Vulnerability.

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