CVE-2026-49813 Overview
CVE-2026-49813 is an OS command injection vulnerability [CWE-78] affecting Dell PowerProtect Data Domain systems. The flaw stems from improper neutralization of special elements passed to operating system commands. A high-privileged attacker with local access can exploit this vulnerability to execute arbitrary commands on the underlying Data Domain Operating System (DDOS).
Dell disclosed the issue in security advisory DSA-2026-278 and published a fix. The vulnerability impacts multiple long-term support (LTS) branches of Data Domain, including LTS2024, LTS2025, and LTS2026 releases.
Critical Impact
Successful exploitation leads to arbitrary command execution with elevated privileges on backup infrastructure, threatening the confidentiality, integrity, and availability of protected enterprise data.
Affected Products
- Dell PowerProtect Data Domain versions 7.7.1.0 through 8.7
- Dell PowerProtect Data Domain LTS2026 versions 8.6.1.0 through 8.6.1.10 and LTS2025 versions 8.3.1.0 through 8.3.1.30
- Dell PowerProtect Data Domain LTS2024 versions 7.13.1.0 through 7.13.1.70
Discovery Timeline
- 2026-07-03 - CVE-2026-49813 published to NVD
- 2026-07-08 - Last updated in NVD database
Technical Details for CVE-2026-49813
Vulnerability Analysis
The vulnerability is classified as an OS command injection issue under CWE-78. Data Domain Operating System accepts input that flows into an operating system command without adequate sanitization of shell metacharacters. Attackers can supply crafted input containing special elements such as ;, |, &&, or backticks to break out of the intended command context.
Exploitation requires local access and high privileges on the appliance. The attacker must already possess authenticated access with elevated rights before triggering the injection. Once triggered, arbitrary commands execute in the context of the vulnerable process, providing a path to full compromise of the backup appliance.
Because Data Domain systems store immutable backup copies used for ransomware recovery, command execution on these systems undermines a core recovery control. Threat actors who reach this stage can tamper with backup data, disable retention locks, or pivot deeper into storage infrastructure.
Root Cause
The root cause is missing or incomplete neutralization of special characters before user-controllable input is concatenated into a shell command string. Dell has not publicly identified the specific administrative interface or subcommand containing the flaw.
Attack Vector
The attack vector is local, requiring authenticated console or shell access to the Data Domain appliance. The attacker submits a crafted argument to a privileged command handler that constructs and executes a shell command. Because privileges are already high, exploitation typically enables lateral movement or persistence rather than initial access. Refer to the Dell Security Update DSA-2026-278 for vendor-provided technical details.
Detection Methods for CVE-2026-49813
Indicators of Compromise
- Unexpected child processes spawned by Data Domain administrative daemons or CLI wrappers.
- Shell metacharacters (;, |, &, `, $() appearing in command arguments captured by audit logs.
- Outbound network connections initiated from the Data Domain appliance to unfamiliar hosts.
Detection Strategies
- Audit Data Domain CLI session logs for administrative commands invoked with unusual argument strings or embedded shell operators.
- Correlate privileged login events with subsequent process execution anomalies on the appliance.
- Baseline expected administrative activity and alert on deviations, particularly commands producing new binaries or scripts on disk.
Monitoring Recommendations
- Forward Data Domain syslog and audit records to a centralized SIEM for retention and correlation.
- Monitor privileged account usage on backup infrastructure and require multi-party approval for sensitive operations.
- Track configuration drift on Data Domain appliances to detect unauthorized changes following administrative sessions.
How to Mitigate CVE-2026-49813
Immediate Actions Required
- Apply the Dell security update referenced in DSA-2026-278 to all affected Data Domain systems.
- Inventory Data Domain appliances against the affected version ranges and prioritize patching internet-adjacent or shared-tenant systems.
- Rotate credentials for high-privileged Data Domain accounts and review recent administrative activity.
Patch Information
Dell has released fixed versions across the affected LTS branches. Consult the Dell Security Update DSA-2026-278 for the exact fixed release numbers corresponding to each supported branch and upgrade path guidance.
Workarounds
- Restrict local and administrative access to Data Domain appliances to a minimal set of trusted operators.
- Enforce role-based access control and remove unnecessary high-privilege roles until patching completes.
- Require jump-host access with session recording for all Data Domain administration to preserve forensic evidence.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
