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PowerProtect Cyber Recovery CVE-2026-79938

| EUVDEUVD-2026-66707 HIGH
Improper Authentication (CWE-287)
2026-08-26 security_alert@emc.com GHSA-qgvx-j2fm-gpj6
8.8
CVSS 3.1 · NVD
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Obtain low-privilege Cyber Recovery account
  2. Delivery
    Connect to management interface remotely
  3. Exploit
    Submit request triggering authentication logic flaw
  4. Execution
    Bypass authorization enforcement
  5. Impact
    Access or manipulate vaulted backup data

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V6 - Authentication Authentication mechanism validation
MITRE ATT&CK

2 techniques across 2 tactics: Defense Evasion, Initial Access

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Exploitation requires a remote attacker to hold at least a low-privileged authenticated account on the Dell PowerProtect Cyber Recovery system, as indicated by PR:L in the CVSS vector. No user interaction is required and attack complexity is rated low (AC:L), meaning no race condition, special timing, or non-default configuration is needed beyond the affected version being reachable over the network. The key limiting factor is the requirement for some level of prior authentication - organizations that strictly control account provisioning on Cyber Recovery systems, enforce strong and unique credentials, and restrict management interface network access significantly reduce exploitability even prior to patching. There is no indication the flaw applies to unauthenticated access.

Impact

The CVSS 8.8 High score (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) positions this as a serious vulnerability - network-accessible, low complexity, requiring only low privileges. Several signals moderate immediate urgency: EPSS at 0.22% (12th percentile) indicates current exploitation is not widespread, and SSVC rates exploitation as 'none' and automatable as 'no,' consistent with no observed threat actor activity. A notable discrepancy exists between the CVSS impact triad (C:H/I:H/A:H, implying full system compromise) and SSVC's 'partial' technical impact rating - security teams should verify actual blast radius against Dell's full advisory before finalizing severity classification. For any organization operating PowerProtect Cyber Recovery as part of ransomware recovery infrastructure, even a mid-sized enterprise IT team should treat this as a priority patching item within the next maintenance window, since compromise of the backup vault directly negates the recovery strategy it underpins. No public POC has been identified and no CISA KEV listing exists at time of analysis.

Exploit ScenarioDerived

An attacker holding a low-privileged account - such as a read-only monitoring or reporting credential - connects remotely to the Dell PowerProtect Cyber Recovery management interface and exploits the improper authentication flaw to gain access beyond their authorized scope. Once authenticated at the elevated level, the attacker can access, exfiltrate, modify, or delete vaulted backup data, directly undermining ransomware recovery capabilities for the victim organization. No public POC has been identified, but the low attack complexity (AC:L) suggests the exploit path does not require unusual preconditions beyond obtaining any valid low-privilege credential.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv2 – Sep 01, 2026

Improper authentication in Dell PowerProtect Cyber Recovery (versions prior to 20.3) allows a remote low-privileged attacker to bypass authorization controls and gain unauthorized access to the backup and recovery environment. The CVSS 8.8 High score reflects network-accessible exploitation with low attack complexity (AV:N/AC:L/PR:L), and full confidentiality, integrity, and availability impact - suggesting the attacker can read, modify, or destroy vaulted backup data. Vendor patch version 20.3.0.0 is available via Dell Security Advisory DSA-2026-370; no active exploitation has been confirmed in CISA KEV and EPSS indicates low current exploitation probability.

Earlier versions of this analysis (1)
v1 Aug 26, 2026 - 20:36 CVSS 7.6

Unauthorized access via authentication bypass in Dell PowerProtect Cyber Recovery versions prior to 20.3 allows a remote attacker holding a low-privilege account to exceed their authorized scope through improper authentication controls. The CVSS vector assigns high integrity impact (I:H), indicating attackers could tamper with or corrupt backup data and recovery configurations - a particularly severe outcome for a platform whose primary purpose is ransomware resilience. No public exploit code has been identified at time of analysis, and the vulnerability is not listed in the CISA KEV catalog.

RemediationAI

Upgrade Dell PowerProtect Cyber Recovery to version 20.3.0.0 or later and apply the corresponding OS update packages (osupdate-15.4.0-19.bin or osupdate-15.6.1-1.bin as applicable to your deployment) per Dell Security Advisory DSA-2026-370 at https://www.dell.com/support/kbdoc/en-us/000501456/. If immediate patching is not feasible, restrict remote network access to the PowerProtect Cyber Recovery management interface to a minimal set of trusted administrator IP addresses via firewall ACLs - this reduces exposure because the attack vector is network-based (AV:N), though it does not remediate the underlying authentication flaw and should not be treated as a long-term substitute. Audit all low-privileged accounts with access to the system and remove or disable unnecessary ones to reduce the credential pool available for exploitation. No vendor-documented workaround replaces the patch.

Affected VersionsENISA

Cyber Recovery 0 <osupdate-15.4.0-19.bin
Power Protect Cyber Recovery 0 <20.3.0.0
Cyber Recovery 0 <osupdate-15.6.1-1.bin

Affected Packages

euvd power_protect_cyber_recovery fix: 20.3.0.0

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Dell PowerProtect Cyber Recovery is an enterprise data protection appliance designed to isolate and vault backup data from ransomware and cyberattack compromise. The vulnerability is rooted in CWE-287 (Improper Authentication), indicating the product fails to adequately verify the identity or authorization level of a requesting entity at some point in its authentication flow - for example, session tokens, API endpoints, or inter-service calls that do not re-validate privilege level. CPE data confirms the affected product as cpe:2.3:a:dell:powerprotect_cyber_recovery:*:*:*:*:*:*:*:* covering all versions prior to 20.3.0.0. EUVD data additionally identifies two OS-level update package thresholds (osupdate-15.4.0-19.bin and osupdate-15.6.1-1.bin), suggesting the flaw may span both application-layer and underlying OS components of the appliance stack. An authentication bypass at this layer is particularly sensitive because PowerProtect Cyber Recovery is explicitly positioned as ransomware recovery infrastructure - compromise of the vault directly undermines the last-resort recovery capability.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (emc) PRIMARY HIGH
NVD 8.8 HIGH
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vuln.today AI 8.8 HIGH

Remote network access and low privileges confirmed by description; full C/I/A impact consistent with unrestricted unauthorized access to a backup vault system.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (emc).

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
CVSS changed
Sep 01, 2026 - 16:22 NVD
7.6 (HIGH) 8.8 (HIGH)
Patch available
Aug 26, 2026 - 22:03 EUVD
CVE Published
Aug 26, 2026 - 20:18 cve.org
HIGH 7.6

DescriptionNVD

Dell PowerProtect Cyber Recovery, versions prior to 20.3, contain an Improper Authentication vulnerability. A low privileged attacker with remote access could potentially exploit this vulnerability, leading to Unauthorized access.

Executive ViewAI

Why It Matters

Dell PowerProtect Cyber Recovery versions prior to 20.3 contain an authentication bypass flaw that allows a low-privileged remote attacker to bypass authorization controls and access the entire backup and recovery environment, including the ability to read, modify, or destroy vaulted backup data. This vulnerability directly undermines the organization's disaster recovery posture and exposes critical business continuity capabilities to compromise. Leadership should prioritize remediation immediately, as successful exploitation could result in loss of the backup/recovery safety net needed to recover from ransomware or data loss incidents.

Business Impact: High
Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score
0.2%
Top 88% exploitable
Prevalence
Medium
enterprise backup appliance for ransomware recovery, not universally deployed
Data Quality
5 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.2%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact
High
Technical Impact
Partial

Priority Score

44
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +44
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

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