CVE-2026-86399 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 Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability. A high privileged attacker with remote access could potentially exploit this vulnerability, leading to Command execution.
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Analysis
by VulDB Data Team • 10/28/2026
The identified vulnerability represents a critical security flaw within Dell PowerProtect Data Domain systems across multiple software release tracks 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 LTS2026 version 8.6.1.20. This flaw is classified as an OS Command Injection vulnerability, which corresponds directly to Common Weakness Enumeration identifier CWE-78 and aligns with the ATT&CK technique T1059 known as Command and Scripting Interpreter. The core technical issue stems from improper neutralization of special elements used in operating system commands within the application code. Specifically, user-supplied input or data processed by the affected software components is not adequately sanitized before being concatenated into shell commands that are subsequently executed by the underlying operating system. This failure to properly escape or validate metacharacters allows an attacker to inject arbitrary command sequences that bypass intended logic and execute with the privileges of the application process.
The operational impact of this vulnerability is severe due to the high privilege level required for exploitation, which paradoxically makes it particularly dangerous in enterprise environments where administrative access controls are strictly enforced but potentially compromised through social engineering or credential theft. An attacker who has obtained remote access credentials with elevated permissions can leverage this flaw to execute arbitrary commands on the host operating system. This capability effectively results in a complete compromise of the data protection appliance, allowing for unauthorized modification of backup configurations, exfiltration of sensitive stored data, installation of persistent backdoors, or use of the compromised device as a pivot point for lateral movement within the internal network. The ability to execute commands at this level undermines the fundamental integrity and confidentiality guarantees provided by the Data Domain platform.
Mitigation strategies must prioritize immediate patching against the specific versions identified in the advisory. Administrators should verify their current software version and apply the latest security updates released by Dell Technologies that address this command injection flaw. In addition to applying patches, organizations should enforce strict access control policies ensuring that remote administrative access is restricted to a minimal set of trusted identities using multi-factor authentication where possible. Network segmentation plays a crucial role in limiting exposure; management interfaces for backup appliances should be isolated from general user networks and internet-facing services. Regular auditing of privileged account usage and monitoring for anomalous command execution patterns can also help detect potential exploitation attempts before significant damage occurs, ensuring the resilience of critical data protection infrastructure against this specific class of injection attacks.