CVE-2026-86396 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 low 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 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 various Long Term Support releases spanning from LTS2024 version 7.13.1.0 up to LTS2026 version 8.6.1.20. This vulnerability is classified as an Improper Neutralization of Special Elements used in an OS Command, commonly referred to as Operating System Command Injection. The core technical deficiency involves the application's failure to adequately sanitize or validate user-supplied input before it is incorporated into system-level commands executed by the underlying operating environment. When specific parameters are passed through affected interfaces without rigorous filtering for special characters such as semicolons, pipes, ampersands, or backticks, these elements can alter the intended command structure. This allows an attacker to inject arbitrary shell commands that execute with the privileges of the compromised service account, effectively bypassing application-level access controls and gaining direct interaction with the host operating system.
From a threat actor perspective, this vulnerability presents a significant risk because it requires only low-privileged remote access for exploitation. In many enterprise backup environments, lower-tier accounts are often granted broader operational permissions to facilitate routine maintenance tasks such as initiating backups or managing storage pools. An attacker who has obtained credentials through phishing, credential stuffing, or other initial access vectors can leverage this weakness to escalate their privileges significantly. By injecting malicious payloads into the command execution pipeline, the adversary can achieve remote code execution on the backup appliance itself. This capability transforms a standard account compromise into a critical infrastructure breach, as Data Domain appliances often store sensitive organizational data and serve as primary targets for ransomware operators seeking to destroy backups before encrypting production systems.
The operational impact of this vulnerability extends beyond immediate system compromise. Successful exploitation can lead to unauthorized modification or deletion of backup repositories, which directly undermines the integrity and availability guarantees provided by enterprise storage solutions. Attackers may use this access to exfiltrate confidential data stored within the appliance, install persistent backdoors for long-term surveillance, or pivot into other network segments if the Data Domain system has broader internal connectivity than intended. Furthermore, because these systems are critical components of disaster recovery strategies, compromising them can render an organization unable to restore operations following a cyber incident, thereby amplifying the business impact far beyond the initial technical breach. The presence of this flaw in widely deployed LTS releases indicates that legacy configurations or older maintenance windows may remain exposed if organizations have not applied the latest security patches provided by Dell Technologies.
To mitigate this risk, immediate patching is required for all affected versions listed in the advisory. Organizations should prioritize updating their PowerProtect Data Domain systems to a version outside the specified vulnerable ranges as soon as possible after validating compatibility with existing workflows. In addition to software updates, defensive measures such as implementing strict network segmentation can limit exposure by ensuring that only authorized management stations and backup clients can communicate with the appliance on necessary ports. Enforcing multi-factor authentication for all administrative accounts reduces the likelihood of credential theft leading to initial access. Furthermore, deploying intrusion detection systems configured to monitor for command injection patterns in web traffic or API calls can provide early warning indicators of exploitation attempts. Regular vulnerability scanning focused specifically on backup infrastructure components is also recommended to ensure that no legacy instances remain unpatched within the enterprise environment. This issue aligns with Common Weakness Enumeration identifier CWE-78 and corresponds to techniques observed in MITRE ATT&CK framework under command and script interpretation, highlighting the need for robust input validation practices across all software development lifecycles involving system-level interactions.