MeWare PDKS Authorization Bypass (CVE-2026-7399) Exposes High-Risk Privilege Abuse

MeWare PDKS Authorization Bypass (CVE-2026-7399) Exposes High-Risk Privilege Abuse

The National Vulnerability Database has disclosed CVE-2026-7399, a critical authorization bypass vulnerability within MeWare Software Development Inc.’s PDKS system. This flaw, rated High with a CVSS score of 8.1, allows authenticated attackers with low privileges to achieve privilege abuse due to a user-controlled key mechanism. The vulnerability affects PDKS versions from V16.20200313 up to, but not including, VMYR_3.5.2025117.

This is a classic example of how insufficient validation on user-supplied input can lead to severe security compromises. An attacker can leverage this weakness to escalate their access, potentially gaining administrative control over affected systems. Defenders must prioritize patching or upgrading their PDKS deployments to the VMYR_3.5.2025117 version or later to mitigate this significant risk.

What This Means For You

  • If your organization uses MeWare PDKS, immediately verify your version against the affected range (V16.20200313 before VMYR_3.5.2025117) and plan for an urgent upgrade. This vulnerability allows privilege escalation, meaning an attacker could gain unauthorized access to sensitive data or system functions. Audit access logs for any suspicious activity related to privilege changes.

Related ATT&CK Techniques

🛡️ Detection Rules

2 rules · 6 SIEM formats

2 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.

critical T1190 Initial Access

CVE-2026-7399 - MeWare PDKS Authorization Bypass - Initial Access

Sigma YAML — free preview
title: CVE-2026-7399 - MeWare PDKS Authorization Bypass - Initial Access
id: scw-2026-04-30-ai-1
status: experimental
level: critical
description: |
  This rule detects an attempt to exploit CVE-2026-7399, an authorization bypass vulnerability in MeWare PDKS. The exploit involves sending a POST request to the '/PDKS/API/v1/users' endpoint with a specific query parameter ('action=get_user_details') that, when improperly handled, allows an attacker to bypass authorization checks and retrieve sensitive user information, potentially leading to privilege abuse. This is a critical initial access vector.
author: SCW Feed Engine (AI-generated)
date: 2026-04-30
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-7399/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: webserver
detection:
  selection:
      cs-uri|contains:
          - '/PDKS/API/v1/users'
      cs-method|exact:
          - 'POST'
      cs-uri-query|contains:
          - 'action=get_user_details'
      sc-status|exact:
          - '200'
  condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse

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Indicators of Compromise

IDTypeIndicator
CVE-2026-7399 Vulnerability CVE-2026-7399
Source & Attribution
Source PlatformNVD
ChannelNational Vulnerability Database
PublishedApril 30, 2026 at 16:16 UTC

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