CVE-2026-77104 in Cloud
Summary
by MITRE • 09/08/2026
CommServe contained a path traversal issue affecting information disclosure. Software customers upgrade to resolved maintenance release. Update CommServe.
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Analysis
by VulDB Data Team • 09/08/2026
The vulnerability identified in CommServe represents a critical path traversal flaw that enables unauthorized access to sensitive system resources, leading to significant information disclosure risks. This type of security defect typically arises when the application fails to properly sanitize or validate user-supplied input before using it as part of file or directory operations. In this specific instance, an attacker can manipulate input parameters to traverse beyond the intended root directories, accessing files and data that should remain restricted to administrative users or internal processes only. The core technical flaw lies in the insufficient validation of path strings, allowing sequences such as dot-dot-slash characters to break out of sandboxed environments and reach arbitrary locations on the underlying operating system file structure.
The operational impact of this vulnerability is severe due to the nature of CommServe as a central management component for enterprise data protection solutions. By exploiting this path traversal issue, an authenticated attacker could potentially read configuration files containing database credentials, API keys, or other secrets stored in plaintext or weakly encrypted formats. This exposure compromises the confidentiality and integrity of the entire backup infrastructure, as attackers may leverage these stolen credentials to escalate privileges, bypass authentication mechanisms, or initiate further attacks against connected systems. The ability to disclose internal file contents undermines trust in the security posture of the organization's data protection strategy and exposes critical business logic and sensitive customer data to potential exfiltration.
From a classification perspective, this vulnerability aligns with CWE-22 Improper Limitation of a Pathname to a Restricted Directory within the Common Weakness Enumeration framework. It also maps closely to MITRE ATT&CK technique T1083 File and Directory Discovery, where adversaries explore local file systems to gather intelligence for subsequent exploitation phases. The lack of strict input validation allows attackers to bypass access controls that rely on directory boundaries rather than robust permission checks at the application logic level. This misconfiguration or coding error highlights a gap in secure design principles regarding how external inputs are processed before being integrated into system commands or file operations.
To mitigate this risk, organizations must immediately apply the vendor-provided maintenance release that addresses the input validation deficiencies within CommServe. It is essential to verify that all instances of the software across the environment have been updated to the resolved version to ensure consistent protection against exploitation. Additionally, administrators should review access logs for any signs of unauthorized path traversal attempts or unusual file read operations prior to patching, as this may indicate active reconnaissance by malicious actors. Implementing network segmentation and restricting direct internet-facing exposure of management interfaces can further reduce the attack surface while ensuring that only authorized personnel have administrative access to critical infrastructure components.