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Severity by source

Vendor (microsoft) PRIMARY
HIGH
qualitative
NVD
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.0 HIGH

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.

3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (microsoft).

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Updated
Jul 20, 2026 - 17:43 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jul 20, 2026 - 17:37 vuln.today
cvss_changed
CVSS changed
Jul 20, 2026 - 17:37 NVD
7.0 (HIGH) 7.8 (HIGH)
Analysis Generated
Jul 14, 2026 - 21:28 vuln.today
CVE Published
Jul 14, 2026 - 17:09 cve.org
HIGH 7.0

DescriptionNVD

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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CVE-2026-50359 vulnerability details – vuln.today

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