EUVD-2026-73281
GHSA-7vcg-9vhw-ghh3
Severity by source
AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Physical-only vector confirmed by description; no prior privileges required; full CIA impact consistent with pre-OS arbitrary code execution gaining complete device control.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
No cwe for this issue in Windows Boot Manager allows an unauthorized attacker to elevate privileges with a physical attack.
AnalysisAI
Privilege escalation in Windows Boot Manager allows an unauthorized attacker with physical access to achieve full pre-OS system compromise, yielding high confidentiality, integrity, and availability impact across a sweeping range of Windows desktop and server editions. The root cause is a protection mechanism failure (CWE-693) in the boot-time security stack - consistent with a Secure Boot or early-launch integrity bypass - that an adversary can exploit without any prior authentication or system privileges once physical access is obtained. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Physical access to the target device is the mandatory and sole prerequisite - CVSS AV:P confirms remote exploitation is categorically impossible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The physical attack vector (AV:P) is the primary limiting factor and significantly constrains real-world exploitability - an attacker must have hands-on access to target hardware, which prevents mass remote exploitation. … 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 for each affected Windows version as detailed in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77892; target build numbers are enumerated in the EUVD version data (e.g., Windows 11 23H2 to 10.0.22631.7582, Windows Server 2025 to 10.0.26100.33438, Windows 10 22H2 to 10.0.19045.7725). … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-693 – Protection Mechanism Failure
View allSame technique Authentication Bypass
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External POC / Exploit Code
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