CVE-2026-79938 Overview
CVE-2026-79938 is an improper authentication vulnerability [CWE-287] affecting Dell PowerProtect Cyber Recovery versions prior to 20.3. A low-privileged attacker with remote network access can exploit this flaw to gain unauthorized access to the system. Successful exploitation compromises the integrity of the cyber recovery environment, which is designed as an isolated last line of defense against ransomware and data destruction attacks.
Dell disclosed the issue in security advisory DSA-2026-370, which addresses multiple third-party component vulnerabilities in the PowerProtect Cyber Recovery product line.
Critical Impact
An authenticated low-privileged attacker can bypass authentication controls remotely to obtain unauthorized access, potentially compromising the isolation guarantees of the cyber recovery vault.
Affected Products
- Dell PowerProtect Cyber Recovery versions prior to 20.3
- Dell PowerProtect Cyber Recovery software components bundled with vulnerable third-party libraries
- Deployments exposing the PowerProtect Cyber Recovery management interface to networked clients
Discovery Timeline
- 2026-08-26 - CVE-2026-79938 published to the National Vulnerability Database
- 2026-08-26 - Last updated in NVD database
Technical Details for CVE-2026-79938
Vulnerability Analysis
The vulnerability originates in the authentication logic of Dell PowerProtect Cyber Recovery. The product fails to correctly verify identity claims for authenticated sessions, allowing a user with limited privileges to escalate their effective access. Because PowerProtect Cyber Recovery serves as a segregated recovery vault for backup data, unauthorized access here undermines the security model that protects immutable copies of critical data.
The flaw is exploitable over the network without user interaction. Attackers already holding low-privilege credentials, such as those obtained through phishing or credential reuse, can leverage the weakness to reach functionality that should be restricted to administrators.
Root Cause
The root cause is classified as Improper Authentication [CWE-287]. The application accepts authentication artifacts or session state without adequately validating that the requester holds the authority associated with the requested action. Dell has not published low-level implementation details in the public advisory.
Attack Vector
Exploitation requires network access to the PowerProtect Cyber Recovery management plane and valid low-privileged credentials. The attacker sends crafted authenticated requests that the server processes without enforcing correct authorization boundaries. No social engineering of a second user is required, and attack complexity is low.
No public proof-of-concept exploit code has been released. Refer to the Dell Security Update DSA-2026-370 for vendor technical details.
Detection Methods for CVE-2026-79938
Indicators of Compromise
- Authentication events from low-privileged accounts followed by access to administrative endpoints on the PowerProtect Cyber Recovery UI or API.
- Unexpected modifications to recovery policies, vault configurations, or replication schedules performed by non-administrative users.
- API requests to privileged routes originating from sessions established with standard user credentials.
Detection Strategies
- Audit PowerProtect Cyber Recovery access logs for privilege boundary violations where a user's session role does not match the sensitivity of the invoked operation.
- Correlate authentication logs with subsequent API calls to identify sessions that access resources beyond the user's assigned role.
- Alert on any administrative action performed by accounts that historically operate only in read-only or operator roles.
Monitoring Recommendations
- Forward PowerProtect Cyber Recovery audit logs to a centralized SIEM and retain them for forensic review.
- Baseline normal administrative activity per account and alert on deviations in source IP, time of day, or command patterns.
- Monitor network traffic to the Cyber Recovery management interface for unexpected clients or automation tooling.
How to Mitigate CVE-2026-79938
Immediate Actions Required
- Upgrade Dell PowerProtect Cyber Recovery to version 20.3 or later as directed by DSA-2026-370.
- Inventory all PowerProtect Cyber Recovery instances and confirm the running version against the advisory.
- Rotate credentials for low-privileged and administrative accounts on affected systems as a precaution.
- Review recent audit logs for signs of unauthorized privileged operations.
Patch Information
Dell has released a fixed version in PowerProtect Cyber Recovery 20.3. Customers should apply the update following the guidance in the Dell Security Update DSA-2026-370. The advisory also addresses additional third-party component vulnerabilities bundled in the same release.
Workarounds
- Restrict network reachability of the PowerProtect Cyber Recovery management interface to a dedicated administrative network segment.
- Enforce multi-factor authentication for all accounts that can log in to PowerProtect Cyber Recovery.
- Apply least-privilege review to existing accounts and disable unused low-privileged accounts until patching is complete.
- Increase log retention and audit review frequency on affected instances during the mitigation window.
# Verify installed PowerProtect Cyber Recovery version and confirm it is 20.3 or later
# Run from the Cyber Recovery management host
crsetup.sh --version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
