CVE-2026-23853: Dell PowerProtect Auth Bypass Vulnerability

CVE-2026-23853 Overview

Dell PowerProtect Data Domain with Data Domain Operating System (DD OS) contains a use of weak credentials vulnerability that allows an unauthenticated attacker with local access to potentially gain unauthorized access to the system. This vulnerability affects multiple release versions including Feature Release versions 7.7.1.0 through 8.5, LTS2025 release versions 8.3.1.0 through 8.3.1.20, and LTS2024 release versions 7.13.1.0 through 7.13.1.50.

Critical Impact

This weak credentials vulnerability enables unauthenticated local attackers to bypass authentication mechanisms and gain unauthorized system access, potentially compromising backup data integrity and confidentiality on enterprise data protection appliances.

Affected Products

• Dell PowerProtect Data Domain with DD OS Feature Release versions 7.7.1.0 through 8.5
• Dell PowerProtect Data Domain with DD OS LTS2025 release versions 8.3.1.0 through 8.3.1.20
• Dell PowerProtect Data Domain with DD OS LTS2024 release versions 7.13.1.0 through 7.13.1.50

Discovery Timeline

• April 17, 2026 - CVE-2026-23853 published to NVD
• April 17, 2026 - Last updated in NVD database

Technical Details for CVE-2026-23853

Vulnerability Analysis

This vulnerability is classified as CWE-1391 (Use of Weak Credentials), indicating that the Dell PowerProtect Data Domain system contains authentication mechanisms that rely on credentials which are insufficiently strong to protect against unauthorized access. The weakness allows attackers with local access to the system to potentially bypass authentication controls without requiring valid user credentials.

The impact of successful exploitation is severe, enabling attackers to achieve high-impact compromise across confidentiality, integrity, and availability of the affected system. Given that PowerProtect Data Domain appliances serve as enterprise backup and data protection infrastructure, unauthorized access could expose sensitive backup data, enable tampering with data protection configurations, or disrupt backup operations entirely.

Root Cause

The vulnerability stems from the use of weak credentials within the Data Domain Operating System. This design flaw (CWE-1391) occurs when default, easily guessable, or insufficiently complex credentials are present in the system, allowing attackers to gain access without exploiting traditional software bugs. The weakness is inherent to the credential management or default configuration within affected DD OS versions.

Attack Vector

The attack requires local access to the Dell PowerProtect Data Domain system. An unauthenticated attacker who has gained local access—either through physical presence, console access, or another local access mechanism—can exploit the weak credentials to authenticate to the system without proper authorization. No user interaction is required, and the attack complexity is low once local access is obtained.

The vulnerability does not require prior privileges, making it accessible to any attacker who can establish local system access. Successful exploitation grants the attacker unauthorized access with potentially high privileges on the data protection appliance.

Detection Methods for CVE-2026-23853

Indicators of Compromise

• Unexpected or unauthorized local login attempts on Dell PowerProtect Data Domain systems
• Authentication logs showing successful logins from unrecognized local accounts or at unusual times
• Configuration changes to DD OS settings without corresponding change management records
• New or modified user accounts on the Data Domain appliance

Detection Strategies

• Monitor authentication logs on Dell PowerProtect Data Domain appliances for failed and successful local authentication events
• Implement file integrity monitoring on critical DD OS configuration files to detect unauthorized modifications
• Review audit logs for privilege escalation attempts or unauthorized administrative actions
• Deploy endpoint detection and response (EDR) solutions to monitor for suspicious local activity on data protection infrastructure

Monitoring Recommendations

• Enable verbose logging for all authentication events on PowerProtect Data Domain systems
• Configure SIEM alerts for multiple failed authentication attempts followed by successful login
• Establish baseline behavior for local system access and alert on deviations
• Regularly audit user accounts and credentials on affected DD OS versions

How to Mitigate CVE-2026-23853

Immediate Actions Required

• Review and inventory all Dell PowerProtect Data Domain appliances running affected DD OS versions
• Apply the security update from Dell as documented in Dell Security Update DSA-2026-060
• Restrict physical and local access to PowerProtect Data Domain systems to authorized personnel only
• Audit existing credentials and enforce strong credential policies on all data protection infrastructure

Patch Information

Dell has released a security update to address this vulnerability. Organizations should apply the patch as described in the Dell Security Update DSA-2026-060. The update addresses the weak credentials vulnerability in affected DD OS versions.

Affected organizations should upgrade to patched versions as documented in the Dell security advisory. Prioritize patching for systems in high-risk environments or those exposed to potential local access threats.

Workarounds

• Implement strict physical security controls to limit local access to PowerProtect Data Domain appliances
• Configure network segmentation to isolate data protection infrastructure from untrusted network segments
• Enable multi-factor authentication where supported for administrative access
• Regularly rotate any default or shared credentials on affected systems until patches can be applied

# Verify current DD OS version
system show version

# Review local authentication configuration
authentication show config

# Audit user accounts on the system
user show list