EUVD-2026-44235
GHSA-54wx-vc69-4w38
Severity by source
AV:L/AC:H/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 VectorVendor: microsoft
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
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 a low-privileged, authorized attacker on a Windows host reclaim a freed object (use-after-free, CWE-416) to run code at elevated privilege. It affects a broad Windows footprint spanning Windows 10 1607 and Server 2012 through Windows 11 26H1 and Server 2025, including Server Core installations. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already possess a low-privileged authenticated account with local code-execution ability on the target Windows system (CVSS AV:L, PR:L), plus the ability to invoke MSXML's vulnerable XML-processing path - for example an application or workload that parses attacker-influenced XML through Microsoft XML Core Services. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals point to a real but constrained, non-urgent priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already holds a low-privileged foothold on a Windows host (for example via phishing or a compromised standard-user account) drives an application or crafted content through the vulnerable MSXML parsing path, triggers the use-after-free, grooms the heap to control the freed object, and wins the race to execute code at higher privilege. No public exploit is identified at time of analysis, and the high attack complexity means success depends on reliable heap/timing control rather than a trivial single-shot trigger. |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50359 documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50359, selecting the KB/build matching each affected Windows 10, Windows 11, or Windows Server (including Server Core) SKU, and deploy via Windows Update, WSUS, or your patch-management tooling. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows 10 (1607-22H2), Windows 11 (26H1), and Windows Server 2012-2025 systems in production, with priority on systems granting local user access or supporting remote workers. …
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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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