CVE-2026-78023

Executive Summary

CVE-2026-78023 is an Authorization Bypass Through User-Controlled Key (CWE-639) vulnerability in Dell Secure Connect Gateway (SCG) Policy Manager versions prior to 5.34.00.16. A remote attacker holding low-privileged credentials can manipulate a user-controlled key to access resources or actions beyond their authorized scope, resulting in privilege elevation. Because the flaw is network-reachable, requires only low privileges, and needs no user interaction, it represents a high-value lateral escalation vector for any organization running the affected appliance.

Technical Analysis

The vulnerability is classified as CWE-639: Authorization Bypass Through User-Controlled Key. This weakness class occurs when an application exposes an identifier — commonly an object reference, account identifier, tenant key, or request-supplied parameter — that is used directly by the authorization logic without verifying that the requesting principal is entitled to the referenced object or permission set. In effect, the access-control decision is anchored to a value the client controls, allowing an authenticated low-privileged user to substitute or increment that value to reach higher-privileged resources or to perform actions reserved for more privileged roles.

Dell Secure Connect Gateway is a connectivity and management appliance that brokers telemetry, support, and policy operations between customer environments and Dell back-end services. SCG Policy Manager governs policy configuration across that gateway. Because this component manages policy state, a successful authorization bypass there affects the integrity of the managed policy domain, not merely a single user's data. The CVSS vector (AV:N/AC:L/PR:L/UI:N) confirms the attack surface is network-accessible, requires low privileges, and demands no user interaction — a straightforward authenticated-request manipulation rather than a memory-safety or unauthenticated flaw.

The describing advisory does not disclose the specific parameter, endpoint, or object identifier that constitutes the user-controlled key, nor the exact authorization function involved. No function names, URL paths, API parameters, or file paths are provided in the source data. Accordingly, the precise request-level mechanics of the key substitution are not derivable from available intelligence. What can be stated with confidence is the vulnerability class behavior: a low-privileged authenticated principal can supply or alter a key value that the authorization layer trusts, causing the system to grant a capability or resource the principal should not hold. This is the canonical "IDOR escalated to authority change" pattern, where the manipulated key maps to a role, policy scope, or delegated identity.

Exploitation Scenarios

No public PoC, exploit code, or Nuclei template exists for CVE-2026-78023. The attack chain below is inferred at the vulnerability-class level from the NVD description and CVSS data; no specific implementation details are asserted.

1. Reconnaissance / target identification. The attacker identifies an internet- or WAN-reachable Dell Secure Connect Gateway appliance running SCG Policy Manager < 5.34.00.16. Fingerprinting relies on service banners, management interface titles, and TLS certificate metadata associated with the product. The attacker confirms reachability of the policy management interface.

2. Prerequisite access. The attacker must already possess low-privileged, authenticated access (PR:L). This may be obtained through a compromised low-privilege account, a service account, or credential reuse. No user interaction is required (UI:N).

3. Triggering the flaw class. In any CWE-639 exploitation, the attacker crafts or replays a legitimate request and modifies the user-controlled key — an identifier the application uses to determine authorization — to reference a higher-privileged object, role, or scope. Because the authorization logic trusts the client-supplied key rather than validating the principal's entitlement, the request is honored at the elevated level. At the class level: an authenticated low-privileged user alters an object/role identifier to bypass the intended authorization boundary.

4. Post-exploitation impact. Successful bypass yields elevation of privileges within SCG Policy Manager. With high confidentiality impact (C:H), the attacker can likely read policy configuration and potentially sensitive gateway-brokered data. With limited integrity impact (I:L), the attacker can likely alter a constrained set of policy or configuration values. The scope is unchanged (S:U), so the impact is contained to the SCG component and its managed policy domain. There is no availability impact (A:N).

Impact Assessment

Business impact centers on the integrity and confidentiality of the policy-management plane for affected gateways. A low-privileged foothold converts into an elevated management role, enabling an attacker to read sensitive configuration (C:H) and make limited but meaningful changes (I:L). Because SCG is an infrastructure connector between the customer environment and Dell support services, compromise of its policy layer can undermine support-channel trust and expose configuration details useful for follow-on lateral movement. The blast radius is scoped (S:U) to the appliance and its policy domain rather than the entire enterprise, but any environment using SCG Policy Manager is in scope; the CVSS base score is 7.1 (High). No availability impact (A:N) limits the risk of outright denial of service, but confidentiality and privilege impact make this a priority finding for environments exposing SCG management interfaces to untrusted networks.

Detection Guidance

Sigma Rule

title: Potential Authorization Bypass via User-Controlled Key - Dell SCG Policy Manager
id: 8f3a2c1e-7802-4b6d-9c11-000000000000
status: experimental
description: Detects anomalous authenticated access patterns consistent with CWE-639 authorization bypass against Dell Secure Connect Gateway Policy Manager.
references:
  - https://nvd.nist.gov/vuln/detail/CVE-2026-78023
author: valtersit.com
date: 2026/01/01
tags:
  - attack.privilege_escalation
  - attack.t1548
logsource:
  category: web
  product: dell_scg
detection:
  selection_auth:
    authenticated: true
  selection_anomaly:
    status: 200
    - or:
      - http.response.status_code: 200
      - action: 'authorization_bypass'
  filter_baseline:
    user_privilege: 'low'
  condition: selection_auth and selection_anomaly and not filter_baseline
falsepositives:
  - Legitimate administrative policy changes
  - Application testing in non-production
level: high

YARA Rule

rule CVE_2026_78023_SCG_PolicyManager_AuthzBypass
{
    meta:
        description = "Detects artifacts associated with authorization bypass through user-controlled key (CWE-639) in Dell Secure Connect Gateway Policy Manager prior to 5.34.00.16"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-78023"
        cve = "CVE-2026-78023"
        cwe = "CWE-639"
        author = "valtersit.com"
        date = "2026-01-01"

    strings:
        $scg1 = "Secure Connect Gateway" ascii nocase
        $scg2 = "SCG Policy Manager" ascii nocase
        $ver1 = "5.34.00.16" ascii
        $kwd1 = "policyManager" ascii nocase
        $kwd2 = "authorization" ascii nocase
        $kwd3 = "privilege" ascii nocase

    condition:
        (uint16(0) == 0x5A4D or true) and
        1 of ($scg1, $scg2) and
        1 of ($kwd1, $kwd2, $kwd3)
}

Suricata IDS Rule

alert http any any -> any any (msg:"CVE-2026-78023 Dell SCG Policy Manager Authorization Bypass Attempt"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"scg"; nocase; http.header; content:"Cookie"; content:"session"; nocase; reference:cve,2026-78023; classtype:attempted-user; sid:202678023; rev:1; metadata:affected_product Secure_Connect_Gateway, created_at 2026_01_01, cve CVE_2026_78023;)

Elastic Detection

sequence by user.id with maxspan=5m
  [ authentication where event.outcome == "success" and user.roles : "low" ]
  [ http where http.response.status_code == 200 and
      http.request.method in ("GET", "POST", "PUT") and
      url.path : "*" and event.outcome == "success" and
      event.action : "authorization_bypass" ]

Splunk SPL Query

index=web sourcetype=dell:scg:policy OR sourcetype=web:proxy
| eval status=coalesce(http_status, status)
| eval method=upper(coalesce(http_method, method))
| search method IN ("GET","POST","PUT") status=200
| stats count values(uri) as uris by src_ip, user
| where count > 0
| lookup scg_low_priv_users user OUTPUT privilege
| where privilege="low"
| sort - count

Wazuh OSSEC Rule

<group name="dell_scg,web,attack,">
  <rule id="202678023" level="12">
    <decoded_as>json</decoded_as>
    <field name="user_privilege">low</field>
    <field name="http_status">200</field>
    <field name="http_method">GET|POST|PUT</field>
    <description>CVE-2026-78023: Potential authorization bypass via user-controlled key against Dell SCG Policy Manager</description>
    <mitre>
      <id>T1548</id>
    </mitre>
    <group>privilege_escalation,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 0/4 (UNPATCHED — no patch evidence from any tracked source). No vendor fix or workaround is confirmed in available intelligence.

1. Immediate mitigations.

   • Restrict network exposure of SCG Policy Manager: place it behind an authenticated reverse proxy, VPN, or management jump host; do not expose the management interface to untrusted or internet-facing networks.
   • Apply least-privilege account provisioning: audit and minimize the population of low-privileged accounts that can reach the policy interface, since PR:L is the only privilege prerequisite.
   • Enforce strong authentication and monitor for anomalous authenticated sessions that perform privileged-looking operations.

2. Patch / upgrade steps.

   • Track Dell's advisory channel for Secure Connect Gateway. The NVD description references versions prior to 5.34.00.16; once Dell publishes a fix, upgrade SCG Policy Manager to 5.34.00.16 or later and verify the applied build.
   • Validate the deployed version against the fixed threshold and re-scan after upgrade.

3. Long-term hardening.

   • Implement server-side authorization that never trusts client-supplied keys — resolve object/role authorization from the authenticated principal's server-side permissions, not from request parameters (the core CWE-639 remediation).
   • Adopt object-level access control checks on every reference to a user-controllable identifier.
   • Maintain continuous vulnerability management and alert on the CVE in asset inventories.

References

• NVD — CVE-2026-78023: https://nvd.nist.gov/vuln/detail/CVE-2026-78023
• NVD CWE-639 — Authorization Bypass Through User-Controlled Key: https://cwe.mitre.org/data/definitions/639.html
• Dell Secure Connect Gateway product/support documentation (advisory channel): https://www.dell.com/support
• MITRE ATT&CK T1548 — Abuse Elevation Control Mechanism: https://attack.mitre.org/techniques/T1548/
• CISA Known Exploited Vulnerabilities catalog (no entry for CVE-2026-78023 as of reporting): https://www.cisa.gov/known-exploited-vulnerabilities-catalog

No threat actor campaign or exploit-in-the-wild evidence is associated with CVE-2026-78023 in the provided data.