CVE-2026-69459: Windows Power Dependency Coordinator Escalation

CVE-2026-69459 Overview

CVE-2026-69459 is a heap-based buffer overflow [CWE-122] in the Windows Power Dependency Coordinator. An authorized local attacker can trigger the overflow to elevate privileges on an affected Windows host. Microsoft assigned the issue a CVSS 3.1 base score of 7.8 with the vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, indicating high impact to confidentiality, integrity, and availability.

The flaw requires local access and low privileges, but no user interaction. Successful exploitation yields code execution in the security context of the vulnerable kernel-adjacent component, enabling attackers to escape standard user boundaries.

Critical Impact
A local, low-privileged attacker can corrupt heap memory in the Power Dependency Coordinator to gain SYSTEM-level privileges on Windows.

Affected Products

Windows (Power Dependency Coordinator component) — consult the Microsoft Vulnerability Advisory CVE-2026-69459 for the authoritative list of affected builds
Servicing branches enumerated in the Microsoft Security Update Guide
Windows Server SKUs sharing the affected component

Discovery Timeline

2026-09-08 - CVE-2026-69459 published to NVD
2026-09-09 - Last updated in NVD database

Technical Details for CVE-2026-69459

Vulnerability Analysis

The Power Dependency Coordinator manages power state transitions and coordinates dependencies among devices and drivers on Windows. A heap-based buffer overflow in this component allows an attacker with a valid local session to write past the bounds of an allocated heap buffer. Because the component runs in a privileged context tied to system power management, overflowing an adjacent heap chunk can corrupt control data used by the kernel or a privileged service.

An attacker exploiting this flaw does not need remote network reachability or user interaction. The overflow can be reached by supplying crafted input to the affected interface from a low-privileged process, resulting in privilege elevation when the corrupted memory is dereferenced.

Root Cause

The root cause is improper validation of a length or size value used when copying attacker-influenced data into a heap allocation. Without an accurate bounds check, the copy operation writes beyond the allocated region, overwriting adjacent heap metadata or object fields. Microsoft has not published exploitation details; refer to the Microsoft Vulnerability Advisory CVE-2026-69459 for vendor guidance.

Attack Vector

Exploitation is local. The attacker must already have code execution as a standard user on the target system, for example through a foothold obtained via phishing, malicious document, or compromised software. From that position, the attacker interacts with the Power Dependency Coordinator interface to trigger the overflow and elevate to SYSTEM. EPSS currently estimates a 0.348% probability of exploitation in the next 30 days, but local elevation-of-privilege bugs of this class are routinely chained into post-compromise workflows.

No verified public exploit code is available for CVE-2026-69459 at time of writing.
See the Microsoft Security Update Guide for the authoritative advisory.

Detection Methods for CVE-2026-69459

Indicators of Compromise

Unexpected crashes, WER reports, or bugchecks referencing the Power Dependency Coordinator or associated power management services
Standard-user processes that suddenly obtain SYSTEM tokens without a legitimate elevation event
New services, scheduled tasks, or drivers installed shortly after an anomalous power-management related crash

Detection Strategies

Hunt for process token elevation from low-integrity to SYSTEM originating from non-standard parents
Alert on Windows Error Reporting entries citing the Power Dependency Coordinator followed by suspicious child process creation
Correlate local logon events with subsequent privileged process creation and driver load events on the same host

Monitoring Recommendations

Ingest Windows Security, System, and Sysmon logs into a centralized analytics platform and retain them long enough to reconstruct post-exploitation activity
Monitor endpoints for behavioral indicators of local privilege escalation, including token manipulation and abnormal handle duplication
Track patch compliance for the Microsoft security update addressing CVE-2026-69459 across all Windows hosts

How to Mitigate CVE-2026-69459

Immediate Actions Required

Apply the Microsoft security update referenced in the Microsoft Vulnerability Advisory CVE-2026-69459 to all affected Windows systems
Prioritize patching on multi-user hosts, jump servers, and developer workstations where local footholds are more likely
Review recent endpoint alerts for signs of local privilege escalation attempts and validate that no unpatched hosts are exposed

Patch Information

Microsoft has issued a security update addressing the heap-based buffer overflow in the Power Dependency Coordinator. Refer to the Microsoft Security Update Guide entry for CVE-2026-69459 for the specific KB numbers, affected builds, and installation guidance. Deploy through Windows Update, WSUS, Microsoft Intune, or your standard patch management tooling.

Workarounds

No vendor-supplied workaround is documented; applying the security update is the required remediation
Enforce least privilege so that fewer users can obtain the interactive local session required to reach the vulnerable interface
Restrict local logon rights and limit installation of untrusted software to reduce the likelihood of an attacker gaining the initial foothold needed to exploit CVE-2026-69459

bash

# Verify installed updates on a Windows host and confirm the KB addressing CVE-2026-69459 is present
wmic qfe list brief /format:table
# Or, using PowerShell:
Get-HotFix | Sort-Object -Property InstalledOn -Descending | Select-Object -First 20