CVE-2026-86398 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. A low privileged 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 branches including Feature Releases 7.7.1.0 through 8.8 and various Long Term Support releases spanning from LTS2024 version 7.13.1.0 up to 7.13.1.80, as well as LTS2025 versions 8.3.1.0 through 8.3.1.40 and LTS2026 versions 8.6.1.0 through 8.6.1.20. This vulnerability is classified under the Common Weakness Enumeration standard as CWE-22, which denotes Improper Limitation of a Pathname to a Restricted Directory, commonly known as path traversal or directory traversal. The core technical deficiency involves an insufficient validation mechanism within the application logic that processes user-supplied input for file paths. Instead of strictly enforcing access boundaries to designated secure directories, the system fails to adequately sanitize or normalize pathname components before using them in filesystem operations. This allows an attacker to manipulate relative references such as dot-dot-slash sequences to escape the intended directory context and navigate up the hierarchical structure of the underlying operating system's file tree.
The operational impact of this vulnerability is significant due to its potential for unauthorized data access and system compromise. An attacker with low-privileged remote access credentials can exploit this flaw by crafting specific requests that include maliciously constructed path strings. By leveraging these crafted inputs, the attacker bypasses standard application-level restrictions designed to isolate user-specific or service-specific directories. Successful exploitation grants the adversary direct filesystem access beyond their authorized scope. This level of access enables the reading of sensitive configuration files, extraction of cryptographic keys, retrieval of stored backup data that may contain proprietary information from other tenants in multi-tenant environments, and potentially further lateral movement within the network infrastructure if additional services are accessible via these exposed paths.
From a threat intelligence perspective, this vulnerability aligns with MITRE ATT&CK technique T1083, which covers File and Directory Discovery, as well as T1552.004 for Unsecured Credentials if sensitive files containing credentials are accessed. The exploitation vector is remote, meaning it does not require physical access to the hardware or local console interaction, thereby increasing its risk profile in networked environments where Data Domain appliances often serve as critical backup repositories. Attackers typically utilize automated scanning tools to probe for this weakness by sending a series of path traversal payloads against exposed endpoints that handle file operations. The lack of proper input validation represents a fundamental design flaw rather than an implementation error, suggesting that the security boundary enforcement is not robust enough to withstand deliberate manipulation of resource identifiers.
Mitigation strategies must prioritize immediate patching and access control hardening. Dell has released updated software versions for all affected release lines that address this path traversal issue by implementing stricter input validation and canonicalization checks before processing file paths. Administrators should upgrade their PowerProtect Data Domain systems to the latest non-vulnerable version available within their respective support lifecycle branches as soon as possible. In addition to patching, organizations should enforce strict network segmentation policies to limit remote access to management interfaces only from trusted IP ranges using multi-factor authentication. Regular vulnerability assessments and penetration testing focused on input validation weaknesses are recommended to identify similar flaws in other components of the backup infrastructure. Monitoring logs for unusual file system access patterns or repeated failed path resolution attempts can also aid in early detection of exploitation attempts before significant data exfiltration occurs.