CVE-2026-86400 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 Authentication vulnerability. An unauthenticated attacker with remote access could potentially exploit this vulnerability, leading to arbitrary command execution with root privileges. This is a critical severity vulnerability as it allows an attacker to take complete control of the system. Dell recommends customers to upgrade at the earliest opportunity.
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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, specifically affecting Feature Release versions 7.7.1.0 through 8.8, LTS2024 releases from 7.13.1.0 to 7.13.1.80, LTS2025 releases from 8.3.1.0 to 8.3.1.40, and LTS2026 releases from 8.6.1.0 to 8.6.1.20. This vulnerability is classified as an Improper Authentication issue, which fundamentally represents a failure in the system's ability to correctly verify the identity of users or processes attempting to access protected resources. In this specific context, the authentication mechanism fails to enforce proper credential validation for certain administrative interfaces or backend services that are exposed to remote network connections. This architectural weakness allows any entity with network connectivity to bypass standard security controls and interact directly with system components without providing valid credentials.
The technical nature of this flaw aligns closely with CWE-287, which describes Improper Authentication, where the software does not properly verify that an actor is who it claims to be before granting access or performing actions. Furthermore, because the exploitation leads to arbitrary command execution with root privileges, the vulnerability also maps to CWE-78, specifically known as OS Command Injection. This combination indicates that the lack of authentication serves as a gateway for injecting malicious system commands into the operating environment. The attacker does not need valid user accounts or passwords; instead, they can send specially crafted requests over the network to trigger these execution paths directly within the privileged context of the root account.
The operational impact of this vulnerability is severe and potentially catastrophic due to its critical severity rating. An unauthenticated remote attacker who gains access to the affected system can achieve complete control over the underlying operating environment. Root privileges provide unrestricted access to all files, configurations, network settings, and installed software on the appliance. This level of compromise allows an adversary to exfiltrate sensitive backup data stored on the Data Domain, modify or delete critical configuration files that could disrupt business continuity operations, install persistent backdoors for long-term access, or pivot into other connected networks within the enterprise infrastructure. Given that PowerProtect Data Domain is often a central component in disaster recovery and data protection strategies, compromising this system undermines the integrity of an organization's entire backup architecture.
From a threat actor perspective, this vulnerability facilitates actions consistent with MITRE ATT&CK techniques such as Initial Access via Network Device Exploitation and Privilege Escalation to gain higher-level permissions. The ability to execute commands remotely without authentication significantly lowers the barrier for entry, making it attractive to automated scanning tools and opportunistic attackers who target widely deployed enterprise storage solutions. Once root access is obtained, subsequent tactics could include Defense Evasion by modifying system logs or creating new administrative accounts that are not subject to standard monitoring, as well as Credential Access if sensitive keys or tokens stored on the appliance can be extracted for further lateral movement.
To mitigate this risk, Dell has released updated software versions that address the authentication logic flaws within the affected components. Organizations running any of the specified vulnerable version ranges must prioritize upgrading their PowerProtect Data Domain appliances to a patched release immediately. It is critical to verify the specific build number against Dell's official security advisory documentation to ensure the correct patch level is applied, as partial updates may not resolve all vectors associated with this vulnerability. In addition to applying software patches, administrators should review network segmentation policies to restrict direct internet-facing access to management interfaces and storage data paths wherever possible. Implementing strict firewall rules that limit administrative port exposure only to trusted internal IP addresses can provide a compensating control while patching efforts are underway. Regular auditing of system logs for unusual authentication attempts or command execution patterns is also recommended to detect any potential exploitation activity that may have occurred prior to remediation.