EUVD-2026-56327
GHSA-j57f-8j97-x258
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only attack vector with low-privilege account sufficient; heap overflow in a SYSTEM-context service yields full triad impact with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Display Enhancement Service allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via heap-based buffer overflow in Windows Display Enhancement Service allows a local low-privileged attacker to gain SYSTEM-level control across a broad swath of Windows desktop and server releases. The vulnerability carries a CVSS 7.8 High score with full confidentiality, integrity, and availability impact upon successful exploitation. No public exploit code has been identified and it is not listed in the CISA KEV catalog at time of analysis, but the breadth of affected versions - spanning Windows 10 through Windows 11 26H1 and Windows Server 2019 through 2025 - makes patching a meaningful operational priority.
Technical ContextAI
CWE-122 (Heap-based Buffer Overflow) describes a write operation that extends past the end of an allocated heap buffer, enabling an attacker to corrupt adjacent heap metadata or function pointers. In this instance, the Windows Display Enhancement Service - a privileged OS component responsible for managing display quality and rendering features - fails to properly validate the size of input before writing to a heap buffer. Because the service runs with elevated privileges, heap corruption allows an attacker to redirect execution into arbitrary code running in a high-integrity or SYSTEM context. The CVSS vector AV:L/AC:L/PR:L confirms that exploitation occurs entirely on the local machine, requires only a standard user account (PR:L), and does not depend on a race condition or complex precondition (AC:L). Affected CPE strings span Windows 10 build 10.0.19044/19045, Windows 11 builds 10.0.22631, 10.0.26100, 10.0.26200, 10.0.28000, and Windows Server builds 10.0.17763, 10.0.20348, and 10.0.26100.
RemediationAI
The primary remediation is to apply the Microsoft-released security update that brings each affected build to or beyond the patched threshold version: Windows Server 2025 to build 10.0.26100.33296 or later; Windows Server 2022 to 10.0.20348.5499 or later; Windows Server 2019 to 10.0.17763.9115 or later; Windows 11 24H2/25H2 to 10.0.26100.9168 / 10.0.26200.9168 or later; Windows 11 23H2 to 10.0.22631.7517 or later; Windows 11 26H1 to 10.0.28000.2704 or later; Windows 10 21H2/22H2 to 10.0.19044.7663 / 10.0.19045.7663 or later. Full advisory and update packages are available at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-61923. Where immediate patching is not feasible, compensating controls include restricting local interactive logon rights to trusted administrators only (reducing the pool of accounts that satisfy PR:L), enforcing application whitelisting to prevent execution of untrusted local code, and monitoring for unusual process privilege escalation via endpoint detection platforms. These mitigations reduce exploitation likelihood but do not eliminate the vulnerable code path.
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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