CVE-2026-50343
Microsoft Install Service Elevation of Privilege Vulnerability
Improper privilege management in Microsoft Install Service allows an authorized attacker to elevate privileges locally.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Microsoft Install Service Elevation of Privilege Vulnerability
Improper privilege management in Microsoft Install Service allows an authorized attacker to elevate privileges locally.
- Record
CVE-2026-50343- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Weakness
- CWE-269
- Updated
- 2026-11-02
EUVDEUVD-2026-43876
Improper privilege management in Microsoft Install Service allows an authorized attacker to elevate privileges locally.
- Record
EUVD-2026-43876- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-hpv9-6w7w-qfg9
Improper privilege management in Microsoft Install Service allows an authorized attacker to...
Improper privilege management in Microsoft Install Service allows an authorized attacker to elevate privileges locally.
- Record
GHSA-hpv9-6w7w-qfg9- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-269
- Updated
- 2026-11-02
NVD
Improper privilege management in Microsoft Install Service allows an authorized attacker to elevate privileges locally.
- Record
CVE-2026-50343- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-269
- Updated
- 2026-11-02
Affected products
- microsoft windows 10 version 1809
- microsoft windows 10 version 21h2
- microsoft windows 10 version 22h2
- microsoft windows 11 version 24h2
- microsoft windows 11 version 25h2
- microsoft windows 11 version 26h1
- microsoft windows server 2019
- microsoft windows server 2019 (server core installation)
- microsoft windows server 2022
- microsoft windows server 2025
- microsoft windows server 2025 (server core installation)
- microsoft windows 10 1809
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | Rat5ak/CVE-2026-50343-InstallService-EoP | 2026-06-03 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-50343 is a high vulnerability (CVSS 7.8) in Microsoft Windows 10 Version 1809, published July 14, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.30%, the 22nd percentile. No source names a fixed version.