CVE-2026-13737: Commvault Command Execution Flaws Expose Networks

TL;DR

Commvault recently disclosed three serious vulnerabilities impacting its enterprise data protection software. These Commvault command execution flaws allow remote attackers to bypass authorization checks and forge server requests. Therefore, administrators must update CommServe and Command Center components immediately.

Why It Matters

Organizations globally rely on Commvault to secure critical business data. A breach here exposes massive amounts of sensitive enterprise information. The two most severe bugs, CVE-2026-13737 and CVE-2026-13738, both carry a critical 9.2 CVSS score. Furthermore, security experts estimate that thousands of global deployments remain at risk. If attackers exploit these weaknesses, they gain unauthorized access to core backup infrastructure.

How the Attack Works

These vulnerabilities affect different parts of the Commvault ecosystem. First, CVE-2026-13737 and CVE-2026-13738 involve improper authorization validation within the CommServe component. According to the official vendor advisory, “CommServe contained an allowlist bypass vulnerability affecting command execution authorization.” Meanwhile, CVE-2026-13739 impacts the Command Center module. A legacy endpoint fails to validate arbitrary target URLs correctly. This oversight enables unauthenticated server-side request forgery. Consequently, attackers can force the server to issue unauthorized network requests to internal resources.

Affected Versions

These Commvault command execution flaws affect multiple software branches. Affected software versions include the 11.36, 11.40, 11.44, and 11.46 releases. They impact both Windows and Linux operating systems. Currently, there is no evidence of active exploitation in the wild. Researchers have also not published any public proof-of-concept exploit code.

Patch and Mitigation Steps

Customers must install the resolved maintenance releases to secure their environments. Upgrade your software immediately to versions 11.46.10, 11.44.11, 11.40.63, or 11.36.114. Ensure you update all related network installations, including CommServe, Webserver, and Media Agents. If immediate patching is impossible, you must restrict network access. Limit CommServe and management interfaces to trusted administrative networks only. Finally, for full remediation details, consult the official Commvault security advisories.

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Written by

@DdoS · Security Researcher

Do Son

Do Son is the Founder and Editor of SecurityOnline.info. Working in cybersecurity since 2013, he reports on vulnerabilities, malware, and emerging threats, providing timely analysis to help organizations and individuals stay ahead of evolving risks.