CVE-2026-50387
Windows GDI Elevation of Privilege Vulnerability
CVE-2026-50387 is a high vulnerability (CVSS 7.8) in Microsoft 365 Copilot, published July 14, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.33%, the 27th percentile. No source names a fixed version.
- Severity
- 7.8 HighCVSS 3.1, CVE List
- Exploit chance
- 0.33%EPSS, 27th percentile
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
- No fix listedNo source names one
Description
Stack-based buffer overflow in Windows GDI 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
Affected products
- microsoft 365 copilot
- microsoft office 365 for mac
- microsoft office for android
- microsoft office ltsc for mac 2021
- microsoft office ltsc for mac 2024
- microsoft 365
- microsoft office 2021
- microsoft office 2024
- microsoft windows 10 version 1607
- microsoft windows 10 version 1809
- microsoft windows 10 version 21h2
- microsoft windows 10 version 22h2
Show 21 moreShow less
- microsoft windows 11 version 24h2
- microsoft windows 11 version 25h2
- microsoft windows 11 version 26h1
- microsoft windows server 2012
- microsoft windows server 2012 (server core installation)
- microsoft windows server 2012 r2
- microsoft windows server 2012 r2 (server core installation)
- microsoft windows server 2016
- microsoft windows server 2016 (server core installation)
- 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 1607
- microsoft windows 10 1809
- microsoft windows 10 21h2
- microsoft windows 10 22h2
- microsoft windows 11 24h2
- microsoft windows 11 25h2
- microsoft windows 11 26h1
What each source reports
CVE List Score used
Windows GDI Elevation of Privilege Vulnerability
Stack-based buffer overflow in Windows GDI allows an authorized attacker to elevate privileges locally.
- Record
CVE-2026-50387- 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-121
- Updated
- 2026-11-10
EUVDEUVD-2026-43932
Stack-based buffer overflow in Windows GDI allows an authorized attacker to elevate privileges locally.
- Record
EUVD-2026-43932- 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
- 2026-11-11
GitHub AdvisoriesGHSA-9q2r-53gw-xr3v
Stack-based buffer overflow in Windows GDI allows an authorized attacker to elevate privileges...
Stack-based buffer overflow in Windows GDI allows an authorized attacker to elevate privileges locally.
- Record
GHSA-9q2r-53gw-xr3v- 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-121
- Updated
- 2026-11-02
NVD
Stack-based buffer overflow in Windows GDI allows an authorized attacker to elevate privileges locally.
- Record
CVE-2026-50387- 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-121
- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | CVE List | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.