EUVD-2026-44237
GHSA-r7pj-9mj2-wq4v
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local low-privilege attacker (AV:L/PR:L) exploiting a use-after-free race (AC:H) with no interaction, yielding full code-execution-level C/I/A within unchanged scope.
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 Windows WebView allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege elevation in the Windows WebView component affects a broad range of currently-supported Windows client and server builds (Windows 10 1809 through Windows 11 26H1, and Windows Server 2019/2022/2025). By triggering a use-after-free (CWE-416) memory-corruption condition, an already-authenticated low-privilege attacker can execute code in a higher-privilege context, yielding full confidentiality, integrity, and availability impact on the local system. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already possess local, low-privilege authenticated access to a Windows system running the vulnerable WebView component (per CVSS PR:L and AV:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 7.0 (High) with vector AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H, meaning local access and existing low privileges are required, exploitation involves meaningful complexity (AC:H, consistent with a use-after-free race window), but success grants full C/I/A impact within an unchanged scope. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already obtained standard-user code execution on a Windows host (for example via a malicious document or a compromised low-privilege service) runs a crafted local program that manipulates WebView object lifecycles to win the use-after-free race and corrupt freed memory. Because exploitation requires local access, low privileges, and no user interaction, the attacker escalates from standard user to a high-privilege context, gaining full control of the machine. … |
| Remediation | Apply the Microsoft security update for CVE-2026-56173 - Patch available per vendor advisory; consult https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56173 for the exact KB and fixed build numbers per affected release, as no single fixed version string was provided in the source data. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, 11, and Server 2019/2022/2025 systems and prioritize critical production servers and administrative machines for immediate patching. …
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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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