EUVD-2026-73049
GHSA-mw3p-3cr2-xg93
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access with low-privilege account required; AC:H reflects UAF race-condition exploitation; full C/I/A impact from privilege escalation to SYSTEM.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
5DescriptionCVE.org
Use after free in Windows Error Reporting allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows Error Reporting (WER) on Windows 11 and Windows Server 2025 is possible through a use-after-free (CWE-416) memory corruption flaw exploitable by a low-privileged authenticated user. The CVSS 7.0 vector (AV:L/AC:H/PR:L) indicates the attack requires local access and elevated complexity - consistent with a race condition or specific timing requirement to win the freed-memory reuse - but no user interaction once staged. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated low-privileged local user account on the vulnerable Windows system (PR:L from CVSS). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world risk is moderate-to-high for environments where untrusted local users can run code on affected Windows 11 or Server 2025 endpoints - multi-user systems, shared workstations, terminal servers, and VDI environments are the primary concern. … 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 | The primary fix is to apply Microsoft's cumulative update raising Windows 11 24H2 to build 10.0.26100.9445 or later, Windows 11 25H2 to 10.0.26200.9445 or later, Windows 11 26H1 to 10.0.28000.2954 or later, and Windows Server 2025 (full and Server Core) to 10.0.26100.33438 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 11 and Windows Server 2025 deployments and classify Windows Server 2025 systems as critical 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
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