EUVD-2026-44283
GHSA-pw8f-4h65-p7v4
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local authenticated user (AV:L/PR:L); AC:H raised from vendor's AC:L because winning a race-condition timing window requires repeated, non-deterministic attempts; full SYSTEM compromise gives C/I/A:H.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Runtime allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Runtime (WinRT) affects Windows 11 (24H2, 25H2, 26H1) and Windows Server 2022/2025, where a race condition in shared-resource handling lets an already-authenticated local user win a timing window to gain higher privileges. Reported by Microsoft with a patch available; there is no public exploit identified at time of analysis and the CVSS base score is 7.8 (High). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already be an authenticated local user on the target (CVSS PR:L, AV:L) with the ability to execute code that calls into the Windows Runtime - this is not remotely reachable and cannot be triggered over the network. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (7.8 High) indicates local attack vector, low complexity, low privileges required, no user interaction, and high confidentiality/integrity/availability impact - a classic local elevation-of-privilege profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already has a low-privileged foothold on a Windows host - for example via phishing-delivered malware or a compromised standard user account - runs a small program that repeatedly invokes the vulnerable WinRT operation while racing a second thread to hit the synchronization window. On a successful race they obtain SYSTEM-level privileges, then disable defenses, install persistence, or pivot. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for your specific Windows build as documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58527 (consult that page for the exact KB article and fixed build number for Windows 11 24H2/25H2/26H1 and Windows Server 2022/2025). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 11 (24H2, 25H2, 26H1) and Windows Server 2022/2025 systems to establish patch scope and prioritize critical infrastructure and administrative workstations. …
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External POC / Exploit Code
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