EUVD-2026-73441
GHSA-qchw-wmgr-j2w5
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local race-condition UAF requires a pre-existing low-privilege session (PR:L) and precise timing (AC:H); scope unchanged; full CIA impact on successful exploitation.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Use after free in Windows Push Notifications allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows Push Notifications (WPN) exploits a use-after-free (CWE-416) to allow a low-privileged authenticated attacker to achieve full system compromise - confidentiality, integrity, and availability all rated High. The flaw spans Windows 11 (23H2 through 26H1) and Windows Server 2022/2025, with Microsoft confirming patch availability via the MSRC update guide. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) an active local session authenticated at low privilege (PR:L per CVSS - any standard domain or local user account qualifies); (2) successful exploitation of a race-condition timing window within the Windows Push Notifications subsystem, raising attack complexity to AC:H and making reliable exploitation harder than single-attempt memory corruption; (3) the Windows Push Notifications service must be active, which is the default configuration on all listed Windows 11 consumer editions and Windows Server 2022/2025 when notification services are enabled. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.0 base score (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H) correctly characterizes this as a meaningful but non-trivial privilege escalation - the AC:H reflects timing precision required to win a race condition, which distinguishes it from a reliable one-shot exploit. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the Microsoft security update bringing each affected release to its minimum fixed build: Windows 11 23H2 to 10.0.22631.7582 or later, Windows 11 24H2 to 10.0.26100.9445 or later, Windows 11 25H2 to 10.0.26200.9445 or later, Windows 11 26H1 to 10.0.28000.2954 or later, Windows Server 2022 to 10.0.20348.5622 or later, and Windows Server 2025 (all variants) to 10.0.26100.33438 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all systems running Windows 11 (23H2 through 26H1) and Windows Server 2022 or 2025 and classify by criticality-production systems, administrative workstations, and domain controllers should be prioritized. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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