CVE-2026-13737 in Commvault
Summary
by MITRE • 08/11/2026
CommServe contained an allowlist bypass vulnerability affecting command execution authorization. Software customers upgrade to resolved maintenance release. Update all Commvault installations, including Commserve, Webserver, Command Center, Media Agents, Clients and HyperScale X.
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Analysis
by VulDB Data Team • 08/11/2026
The vulnerability in CommServe represents a critical authorization flaw that undermines the software's security controls through an allowlist bypass mechanism. This weakness allows unauthorized command execution by circumventing the intended access controls that should restrict which operations can be performed within the system. The issue affects the core Commvault platform components including the Commserve server, Webserver interface, Command Center management console, Media Agents responsible for data operations, Client endpoints, and HyperScale X infrastructure elements. Such a bypass directly violates fundamental security principles of least privilege and defense in depth by enabling malicious actors to execute commands that should be restricted to authorized administrators only.
The technical implementation of this vulnerability stems from improper validation of command authorization within the Commvault framework's access control mechanisms. Attackers can exploit this weakness to submit crafted commands that bypass the allowlist restrictions, effectively gaining elevated privileges without proper authentication or authorization. This type of vulnerability aligns with CWE-285 which addresses insufficient authorization in software systems, and specifically relates to improper access control where the system fails to properly validate command execution rights. The flaw demonstrates poor input validation and authorization checking that allows unauthorized operations to proceed despite security controls designed to prevent such activities.
From an operational impact perspective, this vulnerability creates significant risk for organizations relying on Commvault's data protection services. Successful exploitation could enable attackers to perform critical operations including but not limited to data manipulation, system configuration changes, backup job modifications, and potentially full system compromise. The broad scope of affected components means that a single successful attack could impact the entire data protection ecosystem, from endpoint clients to centralized management servers. This vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under privilege escalation and command and control categories, where adversaries leverage authorization bypasses to expand their access within target environments.
Organizations must immediately implement the vendor-provided maintenance release to remediate this vulnerability. The comprehensive upgrade requirement spanning all Commvault installation types including Commserve, Webserver, Command Center, Media Agents, Clients, and HyperScale X components ensures complete protection against exploitation. Security teams should conduct immediate assessment of their Commvault environments to verify proper implementation of the security update across all affected systems. Additionally, organizations should review their current access controls and authorization policies to identify any potential indicators of compromise related to unauthorized command execution activities that may have occurred before the patch was applied.