CVE-2026-18228 in HyperScale
Summary
by MITRE • 10/13/2026
HyperScale contained a path traversal issue affecting information disclosure. Software customers upgrade to resolved maintenance release. Update Commvault installation of HyperScale MediaAgents.
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Analysis
by VulDB Data Team • 10/13/2026
The vulnerability identified within the Commvault HyperScale architecture represents a critical path traversal flaw that facilitates unauthorized access to sensitive system resources and data stores. This security defect stems from insufficient validation or sanitization of user-supplied input when processing file paths, allowing an attacker to manipulate directory navigation sequences such as dot-dot-slash characters to escape the intended application sandbox. By exploiting this weakness, malicious actors can traverse outside the designated directories where HyperScale MediaAgents store configuration files, logs, and potentially sensitive backup metadata. The core technical flaw lies in the failure of the software to properly restrict file system access controls based on the context of the request, thereby violating the principle of least privilege and enabling information disclosure that compromises the confidentiality integrity of the underlying infrastructure.
From an operational perspective, this vulnerability poses a significant risk to organizations relying on Commvault HyperScale for their data protection strategies. Successful exploitation could lead to the exposure of internal network configurations, authentication credentials embedded in configuration files, or proprietary backup indexing data. Such information leakage provides adversaries with valuable intelligence that can be leveraged for further attacks, including privilege escalation, lateral movement within the enterprise network, or targeted ransomware deployment against identified critical assets. The impact extends beyond mere data theft; it undermines trust in the integrity of the disaster recovery solution and may result in regulatory non-compliance depending on the nature of the disclosed information and applicable industry standards regarding data protection and privacy.
This vulnerability aligns with CWE-22, which classifies Improper Limitation of a Pathname to a Restricted Directory, commonly known as path traversal or directory traversal attacks. In terms of offensive security frameworks, this flaw supports techniques categorized under ATT&CK T1083, specifically File and Directory Discovery, where adversaries explore the target file system to gather information for subsequent phases of an intrusion campaign. The ability to read arbitrary files is often a precursor to more severe compromises, making its remediation a high priority in any security hardening initiative.
To mitigate this risk, organizations must immediately apply the resolved maintenance release provided by Commvault that addresses the input validation logic within HyperScale MediaAgents. It is imperative to update all instances of the affected software across the deployment environment to ensure consistent protection against exploitation. Beyond patching, administrators should review access control lists and file permissions on server hosts running HyperScale components to enforce strict separation between application directories and sensitive system files. Regular security audits and penetration testing focused on input validation weaknesses are recommended to identify similar vulnerabilities in other integrated systems within the data protection ecosystem.