CVE-2026-86388 in PowerProtect Data Domain
Summary
by MITRE • 10/28/2026
Dell PowerProtect Data Domain, Feature Release versions 7.7.1.0 through 8.8, LTS2024 release versions 7.13.1.0 through 7.13.1.80, LTS2025 release versions 8.3.1.0 through 8.3.1.40, LTS2026 release versions 8.6.1.0 through 8.6.1.20, contain an Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability. An unauthenticated attacker with remote access could potentially exploit this vulnerability, leading to Filesystem access for attacker.
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Analysis
by VulDB Data Team • 10/28/2026
The identified security flaw resides within Dell PowerProtect Data Domain systems across multiple software release tracks including Feature Releases 7.7.1.0 through 8.8 and Long Term Support releases spanning LTS2024, LTS2025, and LTS2026 versions. This vulnerability is classified as an Improper Limitation of a Pathname to a Restricted Directory, commonly known in the industry as Path Traversal or Directory Traversal. The core technical issue stems from insufficient validation or sanitization of user-supplied input that dictates file system paths within the application logic. When the software processes these inputs, it fails to adequately restrict access to only the intended restricted directory, allowing an attacker to manipulate path sequences such as dot-dot-slash characters to escape the designated sandbox and traverse upward through the hierarchical file structure. This architectural weakness effectively bypasses the isolation mechanisms designed to protect critical system files from unauthorized modification or reading by external entities.
From a threat actor perspective, this vulnerability is particularly severe because it can be exploited by an unauthenticated attacker who possesses remote network access to the target system. The absence of required authentication for exploitation significantly lowers the barrier to entry for malicious actors, enabling them to initiate attacks without needing valid credentials or prior compromise of user accounts. Once the path traversal mechanism is successfully leveraged, the immediate operational impact involves unauthorized filesystem access. This grants the attacker the ability to read sensitive configuration files, extract cryptographic keys, view proprietary data stored on the appliance, or potentially write malicious scripts and binaries into executable directories if file permissions allow such operations. The compromise of these underlying system components can lead to a complete loss of confidentiality for backed-up data and integrity violations where critical system configurations are altered to facilitate persistent access or further lateral movement within the network environment.
In terms of industry-standard classification, this vulnerability aligns with Common Weakness Enumeration identifier CWE-22 which specifically addresses Improper Limitation of a Pathname to a Restricted Directory. The exploitation technique maps directly to MITRE ATT&CK techniques related to File and Directory Discovery as well as Command and Scripting Interpreter if the traversal leads to execution capabilities. The ability to access arbitrary files on the operating system level represents a critical escalation from application-layer flaws to OS-level compromise, undermining the foundational security posture of the data protection appliance. Organizations relying on Dell PowerProtect Data Domain for their backup infrastructure must recognize that this flaw exposes not just the management interface but potentially the entire storage backend if the traversal allows access to database files or encryption material stored in deeper system directories.
To mitigate this risk, immediate action is required by applying the vendor-provided software patches and updates that address the input validation logic within the affected components. Administrators should verify their current version against the specified vulnerable ranges and prioritize upgrading to a fixed release as soon as possible. In environments where patching cannot be implemented immediately due to operational constraints, network segmentation strategies should be employed to restrict remote access to the management interfaces of these appliances. Access control lists on firewalls or security groups should limit connectivity to trusted administrative IP addresses only, thereby reducing the attack surface available to unauthenticated attackers attempting to exploit this path traversal flaw. Continuous monitoring for anomalous file system activity and log analysis can also help in detecting potential exploitation attempts before significant damage occurs.