Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local use-after-free needing an existing low-priv foothold (AV:L/PR:L) and a hard-to-win heap race (AC:H), yielding full local compromise (C/I/A:H) without scope change.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
Lifecycle Timeline
5DescriptionNVD
Use after free in Microsoft XML Core Services allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Microsoft XML Core Services (MSXML) lets an already-authenticated user on affected Windows 10, Windows 11, and Windows Server systems corrupt memory via a use-after-free (CWE-416) and run code at elevated privilege. The flaw was reported by Microsoft and is patched; there is no public exploit identified at time of analysis, and EPSS estimates a low 0.25% (16th percentile) exploitation probability. Impact is total (high confidentiality, integrity, and availability) but requires prior local access.
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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
Leaving vuln.today
EUVD-2026-44235
GHSA-54wx-vc69-4w38