EUVD-2026-73434
GHSA-246x-x78r-crmr
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access and low privileges required; AC:H reflects UAF race-condition requirement; full CIA reflects SYSTEM-level post-exploitation impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Use after free in Microsoft COM for Windows allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Microsoft COM for Windows allows a low-privileged authenticated attacker to gain full SYSTEM-level control via a use-after-free memory corruption flaw. The vulnerability affects a broad range of current Windows client and server releases, from Windows 10 21H2 through Windows 11 25H2 and Windows Server 2022/2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a low-privileged authenticated local session on the affected Windows host (PR:L in CVSS); remote unauthenticated exploitation is not described. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.0 score (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately reflects a meaningful but non-trivial local privilege escalation: an attacker must already hold a low-privileged local account and must successfully exploit a race-condition or precise heap-grooming scenario (AC:H). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the Microsoft-released patches via Windows Update or WSUS targeting the minimum fixed builds listed above for each affected OS version; the authoritative update guide is at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69299. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit your Windows environment to identify all systems running Windows 10 21H2, Windows 11 (all versions through 25H2), and Windows Server 2022/2025 to determine patch priority. …
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Same weakness CWE-416 – Use After Free
View allSame technique Privilege Escalation
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External POC / Exploit Code
Leaving vuln.today