EUVD-2026-43863
GHSA-q2jw-79qw-q59g
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local EoP requiring an existing low-privileged account (AV:L, PR:L), no victim interaction (UI:N), and a memory-corruption overflow yielding full code execution and thus high C/I/A.
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
Stack-based buffer overflow in Windows App Installer allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows App Installer (the MSIX/AppX package deployment component, msixbundle/App Installer) lets an already-authenticated low-privileged user overflow a stack buffer to gain higher privileges on affected Windows 10, Windows 11, and Windows Server builds. Microsoft self-reported the flaw and has shipped a patch; there is no public exploit identified at time of analysis and it is not listed in CISA KEV. …
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 the attacker to already be an authorized local user on the target (CVSS PR:L, AV:L) and to get the vulnerable Windows App Installer code path to process attacker-controlled data that triggers the stack overflow - i.e., invoking App Installer / the appinstaller handler against a crafted MSIX/App Installer package. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are internally consistent and point to a genuine but not emergency-tier priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already obtained a low-privileged foothold on a Windows host - for example a standard domain user on a shared workstation or an RDP session on a terminal server - invokes App Installer with a maliciously crafted MSIX/App Installer input that overflows the stack buffer. The corruption lets them execute code in the elevated context of the deployment component, escalating from standard user to SYSTEM/administrator. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50400; a vendor patch is available (Patch available per vendor advisory) via the standard cumulative/monthly update channel - consult https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50400 for the exact fixed build numbers per OS version, as the input does not provide a single fix version string. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, Windows 11, and Windows Server systems to assess exposure scope and identify highest-priority assets for patching. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
More in Windows 10 Version 1607
View allLocal privilege escalation in Microsoft Active Directory Federation Services (AD FS) lets an already-authenticated low-p
Local privilege escalation in the Microsoft Windows Kernel allows an unauthorized attacker to gain elevated (SYSTEM-leve
Local privilege escalation in the Windows Win32K kernel subsystem (CWE-122 heap-based buffer overflow) lets an already-a
Local code execution in the Windows DHCP Client service stems from a use-after-free (CWE-416) memory-corruption flaw aff
Local code execution in the Microsoft Message Queuing (MSMQ) Queue Manager affects a broad range of Windows client and s
Remote code execution in the Microsoft Windows DHCP Server role allows an unauthenticated network attacker to run arbitr
Elevation of privilege in the Windows NTFS file-system driver lets an already-authenticated local user escalate to SYSTE
Local code execution in the Windows Media component of supported Windows 10, Windows 11, and Windows Server (2016 throug
Elevation of privilege in the Windows Hyper-V virtual network switch (VMSwitch) lets an authenticated attacker operating
Remote code execution in the Windows Server Network driver stems from a race condition (CWE-362) that lets an unauthoriz
Remote code execution in Microsoft Windows Remote Desktop (RDP) allows an unauthorized network attacker to run arbitrary
Remote code execution in Microsoft Windows Message Queuing (MSMQ) allows an unauthenticated attacker to run arbitrary co
Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Buffer Overflow
View allShare
External POC / Exploit Code
Leaving vuln.today