CVE-2026-78339

Executive Summary

CVE-2026-78339 is an Incorrect Permission Assignment for Critical Resource vulnerability (CWE-732) in Dell Secure Connect Gateway (SCG) Policy Manager versions prior to 5.34.00.16. A low-privileged attacker with local access to an affected host could exploit overly permissive resource permissions to disclose sensitive information, bypass protection mechanisms, and gain unauthorized access to protected resources. The vulnerability carries a CVSS base score of 6.3 and, at the time of writing, has no public proof-of-concept, no vendor patch confirmation from tracked sources, and no known exploitation in the wild.

Technical Analysis

The vulnerability class is CWE-732: Incorrect Permission Assignment for Critical Resource. This weakness occurs when a software product assigns permissions to a security-critical resource—such as a file, directory, registry key, service, or IPC object—in a way that allows unintended actors to read, modify, or otherwise access it. In the context of Dell Secure Connect Gateway Policy Manager, the "critical resource" is a component of the SCG Policy Manager application whose access controls are set more permissively than intended in versions prior to 5.34.00.16.

The CVSS vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N provides the following breakdown:

• Attack Vector (AV:L): Local. The attacker must already have some form of local access (e.g., an interactive session, shell, or low-privilege account) on the host running SCG Policy Manager, or must be able to reach the local resource through a local vector. This is not remotely exploitable over the network.
• Attack Complexity (AC:H): High. Exploitation requires conditions beyond the attacker's direct control—specific timing, race conditions, or particular environmental configurations—that make reliable exploitation harder than a trivial permission read.
• Privileges Required (PR:L): Low. The attacker needs only low-privileged credentials or a low-privileged local account to attempt exploitation.
• User Interaction (UI:N): None. No victim user action is required; the attacker can trigger the flaw unilaterally once local access and the necessary conditions are met.
• Scope (S:U): Unchanged. The impact is confined to the security authority of the vulnerable SCG Policy Manager component.
• Confidentiality (C:H): High. Exploitation can lead to disclosure of sensitive information—credentials, configuration data, or policy content managed by SCG.
• Integrity (I:H): High. The attacker can modify protected resources, leading to protection mechanism bypass and unauthorized access.
• Availability (A:N): None. The vulnerability does not directly impact availability.

Because the NVD description is sparse and does not identify the specific resource, permission, or application component affected, the precise code-level mechanism cannot be stated. What is known is that the defect is a misassignment of permissions on a critical resource, meaning that an intended low-privilege boundary (e.g., a non-administrative user or service account) can cross into a resource that should be restricted to a higher privilege level. The combination of C:H and I:H with PR:L indicates that a low-privilege local actor can both read and write a resource that should be protected, which is the classic enabler for privilege escalation, credential theft, or tampering with SCG policy data.

The affected attack surface is local to the SCG Policy Manager host. SCG Policy Manager is an enterprise management component used to configure and monitor Dell Secure Connect Gateway deployments; as such, the resources it manages are security-relevant (policy configuration, connectivity settings, and potentially credentials for managed environments). A permission defect on any such resource is significant because it undermines the trust boundary between low-privilege operators and the management plane.

No public exploit code, Nuclei template, or PoC is available for this CVE. The analysis above is derived strictly from the vendor description, the assigned CWE, and the CVSS vector; no specific file paths, function names, or endpoints have been disclosed by the vendor.

Exploitation Scenarios

The following attack chain is described at the vulnerability-class level, since no specific implementation details (resource names, paths, or parameters) are available from the NVD description. No public PoC exists; this chain is inferred from the CWE-732 class and the CVSS vector.

1. Reconnaissance / target identification. The attacker obtains local access to a host running Dell SCG Policy Manager at a version prior to 5.34.00.16, typically through a compromised low-privileged account, an initial-access foothold, or authorized-but-limited local access. The attacker enumerates the local system to identify resources belonging to SCG Policy Manager and inspects their access control settings (filesystem permissions, service permissions, or registry/ACL configuration) to find one whose permissions are broader than the documented or expected privilege model.

2. Triggering the flaw class. Because the resource's permissions are incorrectly assigned (CWE-732), the low-privilege attacker can access it directly without needing to elevate first. The "High" attack complexity (AC:H) implies the attacker may need to satisfy additional preconditions—such as operating during a particular service state, interacting with a shared resource, or chaining the access with another local condition—before the misassigned permissions become exploitable in a useful way. The attacker does not need to defeat authentication or exploit a memory-safety bug; the permission misconfiguration itself is the vulnerability.

3. Payload / execution method (class level). At the vulnerability-class level, the attacker leverages the excessive permissions either to read sensitive content from the critical resource (information disclosure) or to modify it (integrity impact and protection mechanism bypass). Depending on what the resource is—configuration data, policy definitions, credential material, or an executable/script referenced by a privileged service—the attacker may use the write capability to influence the behavior of a higher-privileged component. Where the misassigned resource is consumed by a privileged process, modifying it can cause that process to operate on attacker-controlled data or code, yielding unauthorized access at a higher privilege level.

4. Post-exploitation impact. Successful exploitation yields the triad stated by the vendor: information disclosure, protection mechanism bypass, and unauthorized access. Concretely, the attacker can read data that should be restricted (C:H) and alter protected resources (I:H), which can translate into privilege escalation on the SCG host, manipulation of SCG policy configuration, or exposure of sensitive management-plane data used to administer connected environments. Because the scope is unchanged (S:U), the impact is contained to the SCG Policy Manager security authority rather than crossing into unrelated security domains, but the compromise of a management component can still have downstream operational consequences for the environments SCG governs.

Impact Assessment

Business impact centers on the confidentiality and integrity of the SCG Policy Manager management plane. With CVSS 6.3 (Medium), the vulnerability is not remotely and trivially exploitable, but it is a meaningful local privilege and trust-boundary issue. The PR:L / AV:L combination means the attacker must already be on the host with a low-privilege account, which raises the bar for an external adversary but makes this a potent post-compromise escalation and data-theft primitive.

• Confidentiality (High): Disclosure of sensitive configuration, policy, or credential material held by SCG Policy Manager.
• Integrity (High): Unauthorized modification of protected resources and bypass of protection mechanisms.
• Availability (None): No direct availability impact is indicated by the vector.
• Blast radius: Systems running Dell SCG Policy Manager prior to 5.34.00.16. Because SCG is a management/gateway component, compromise can extend operationally to the managed estate it administers, even though the CVSS scope is unchanged.
• Exploitability: EPSS has not scored this CVE; no public exploit, PoC, or Nuclei template is available. CISA KEV does not list it. Real-world exploitation has not been observed in available data.

Detection Guidance

Sigma Rule

title: Potential SCG Policy Manager Critical Resource Permission Abuse (CVE-2026-78339)
id: 8f2a1c74-9b3e-4d21-a6f7-5c0e9d1b2a44
status: experimental
description: Detects local access or modification activity targeting Dell Secure Connect Gateway Policy Manager resources indicative of CWE-732 permission abuse on versions prior to 5.34.00.16
references:
  - https://nvd.nist.gov/vuln/detail/CVE-2026-78339
author: valtersit.com
date: 2026/01/01
tags:
  - attack.privilege_escalation
  - attack.t1068
  - cve.2026.78339
logsource:
  category: process_creation
  product: windows
detection:
  selection_img:
    Image|endswith:
      - '\cmd.exe'
      - '\powershell.exe'
      - '\pwsh.exe'
      - '\net.exe'
      - '\icacls.exe'
  selection_cmd:
    CommandLine|contains:
      - 'Secure Connect Gateway'
      - 'SCG'
      - 'Policy Manager'
      - 'icacls'
      - 'takeown'
  condition: selection_img and selection_cmd
falsepositives:
  - Legitimate administrative maintenance of SCG Policy Manager by authorized administrators
level: medium

YARA Rule

rule CVE_2026_78339_SCG_PolicyManager_PermAbuse
{
    meta:
        description = "Detects references to Dell SCG Policy Manager permission-related artifacts associated with CVE-2026-78339"
        author = "valtersit.com"
        date = "2026-01-01"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-78339"
        cve = "CVE-2026-78339"

    strings:
        $s1 = "Secure Connect Gateway" ascii wide nocase
        $s2 = "Policy Manager" ascii wide nocase
        $s3 = "5.34.00.16" ascii wide

    condition:
        uint16(0) == 0x5A4D and any of ($s1, $s2, $s3)
}

Suricata IDS Rule

alert http any any -> any any (msg:"CVE-2026-78339 Dell SCG Policy Manager Access Attempt"; flow:established,to_server; http.uri; content:"Policy"; nocase; http.uri; content:"Manager"; nocase; classtype:attempted-user; reference:cve,2026-78339; reference:url,nvd.nist.gov/vuln/detail/CVE-2026-78339; sid:202678339; rev:1;)

Elastic Detection

process where event.type == "start" and
  process.parent.name != null and
  (
    process.command_line : "*Secure Connect Gateway*" or
    process.command_line : "*Policy Manager*" or
    process.command_line : "*icacls*" or
    process.command_line : "*takeown*"
  ) and
  process.name : ("cmd.exe", "powershell.exe", "pwsh.exe", "net.exe", "icacls.exe", "takeown.exe")

Splunk SPL Query

index=endpoint (ProcessName IN ("cmd.exe","powershell.exe","pwsh.exe","icacls.exe","takeown.exe","net.exe"))
(CommandLine="*Secure Connect Gateway*" OR CommandLine="*SCG*" OR CommandLine="*Policy Manager*" OR CommandLine="*icacls*" OR CommandLine="*takeown*")
| stats count min(_time) as first_seen max(_time) as last_seen by host, user, ProcessName, CommandLine
| where count > 0
| sort - last_seen

Wazuh OSSEC Rule

<group name="windows,sysmon,cve-2026-78339,">
  <rule id="2026783" level="10">
    <if_sid>61603</if_sid>
    <field name="win.eventdata.image">cmd.exe|powershell.exe|pwsh.exe|icacls.exe|takeown.exe|net.exe</field>
    <field name="win.eventdata.commandLine">Secure Connect Gateway|Policy Manager|icacls|takeown</field>
    <description>CVE-2026-78339: Possible SCG Policy Manager critical resource permission abuse</description>
    <mitre>
      <id>T1068</id>
    </mitre>
    <group>cve_2026_78339,privilege_escalation,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 0/4 (UNPATCHED — no patch evidence from any tracked source).

1. Immediate mitigations

   • Restrict local interactive and low-privilege account access to hosts running Dell SCG Policy Manager; enforce least privilege and remove unnecessary local accounts.
   • Audit the access control settings (ACLs) of SCG Policy Manager resources on affected hosts and tighten any that are broader than required by the vendor's supported configuration.
   • Monitor local process and file/registry access events for anomalous interaction with SCG resources using the detection rules above.
   • Isolate the SCG Policy Manager management network segment so that a local compromise cannot be leveraged laterally.

2. Patch/upgrade steps

   • Upgrade Dell Secure Connect Gateway Policy Manager to version 5.34.00.16 or later, the fixed release identified in the vendor description. No vendor fix or workaround is currently confirmed by any tracked source, so validate the upgrade against the Dell advisory for CVE-2026-78339 before and after deployment.
   • Confirm the installed version before and after remediation and record the change for compliance.

3. Long-term hardening

   • Establish a vulnerability management cadence that continuously tracks Dell SCG advisories, given the unpatched status in tracked sources.
   • Enforce strong access control reviews for all management-plane components; treat incorrect permission assignment (CWE-732) as a recurring risk class and audit for it regularly.
   • Apply the principle of least privilege across local accounts and service accounts on management hosts.
   • Maintain detection coverage for lateral movement and privilege escalation originating from low-privilege local accounts.

References

• NVD — CVE-2026-78339: https://nvd.nist.gov/vuln/detail/CVE-2026-78339
• Dell Secure Connect Gateway security advisories: https://www.dell.com/support/security
• CWE-732 — Incorrect Permission Assignment for Critical Resource: https://cwe.mitre.org/data/definitions/732.html
• FIRST EPSS (not yet scored for CVE-2026-78339): https://www.first.org/epss/
• CISA Known Exploited Vulnerabilities Catalog (CVE-2026-78339 not listed): https://www.cisa.gov/known-exploited-vulnerabilities-catalog

No known threat actor campaigns or exploit-in-the-wild evidence are associated with CVE-2026-78339 in available data; the CVE is not listed in CISA KEV, has no public PoC, and no Nuclei template.