High

Desktop Window Manager Elevation of Privilege Vulnerability

IdentifiersCVE-2026-32155CWE-416· Use After Free

CVE-2026-32155 is an elevation-of-privilege vulnerability in Microsoft Desktop Window Manager (DWM) caused by a use-after-free condition. According to the provided advisory content, the flaw allows a local, authorized attacker with low privileges to trigger memory corruption in DWM after an object is freed and subsequently reused. Microsoft classifies the issue as Important and assigns CVSS v3.1 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). The available information does not identify the specific vulnerable function or code path, but indicates that successful exploitation can elevate privileges locally and may also destabilize the system.

For your environment

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows a local authorized attacker to elevate privileges on the affected Windows system. Based on the provided CVSS impacts and advisory text, compromise can result in high confidentiality, integrity, and availability impact. Microsoft also states exploitation could potentially allow the attacker to crash the system, including from a standard user context.

Mitigation

If you can’t patch tonight, do this now.

No specific vendor workaround or mitigation is provided in the supplied advisory content. Until patches are deployed, reduce exposure by restricting local access for untrusted or low-privileged users, minimizing opportunities for interactive logon on affected systems, and prioritizing patch deployment on multi-user and high-value Windows endpoints.

Remediation

Patch, then assume compromise.

Apply the official Microsoft security update for CVE-2026-32155 on all affected systems via the Microsoft Security Update Guide or normal Windows update channels. Because the issue is in Desktop Window Manager and no alternative code-level remediation is provided in the supplied content, patching is the primary remediation.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

Microsoft CorporationWindowsoperating_system

Microsoft CorporationWindows 10 21h2operating_system

Microsoft CorporationWindows 10 22h2operating_system

Microsoft CorporationWindows 11 23h2operating_system

Microsoft CorporationWindows 11 24h2operating_system

Microsoft CorporationWindows 11 25h2operating_system

Microsoft CorporationWindows Server 2022operating_system

Microsoft CorporationWindows Server 2022 23h2operating_system

Microsoft CorporationWindows Server 2025operating_system

Microsoft CorporationWindows Server 23h2operating_system

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

2 SOURCESView more in app

talos intelligence blogNews

Apr 14, 2026

Microsoft Patch Tuesday for April 2026 - Snort Rule and Prominent Vulnerabilities

A Desktop Window Manager elevation of privilege vulnerability.

msrc microsoftNews

Apr 14, 2026

CVE-2026-32155 - Security Update Guide - Microsoft - Desktop Window Manager Elevation of Privilege Vulnerability

A local elevation of privilege vulnerability in Microsoft Desktop Window Manager caused by a use-after-free condition.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity