EUVD-2026-73283
GHSA-w3v4-v785-42qw
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access required with high complexity for race timing; low privilege sufficient; no scope change; full C/I/A impact after LPE to SYSTEM.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Installer allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows Installer (msiexec) affects every major Windows release from Server 2012 through Windows 11 26H1 and Server 2025, allowing a low-privileged authenticated attacker to achieve full SYSTEM-level control by winning a race condition against the installer's SYSTEM-context file operations. The vulnerability (CWE-362) requires high attack complexity due to the inherent timing constraints of race window exploitation, but no user interaction is needed once local code execution is established. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local user account with standard (low) privileges - no administrative rights are needed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.0 score accurately reflects meaningful exploitation constraints: AV:L limits the attack surface to local code execution, and AC:H acknowledges that race conditions are timing-dependent and may require repeated attempts or specific system load conditions to land reliably. … 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 Microsoft's security update for the relevant Windows version via Windows Update, WSUS, or Microsoft Update Catalog - specific patch KB identifiers and exact build numbers by OS version are listed in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77894. … 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 Server 2012 R2 through 2025 and Windows 11 through 26H1 to establish baseline exposure. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
Same weakness CWE-362 – Race Condition
View allSame technique Race Condition
View allShare
External POC / Exploit Code
Leaving vuln.today