CVE-2026-83903
Windows Direct Composition Elevation of Privilege Vulnerability
Heap-based buffer overflow in Windows Direct Composition 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
Windows Direct Composition Elevation of Privilege Vulnerability
Heap-based buffer overflow in Windows Direct Composition allows an authorized attacker to elevate privileges locally.
- Record
CVE-2026-83903- 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-122
- Updated
- 2026-11-10
EUVDEUVD-2026-100035
Heap-based buffer overflow in Windows Direct Composition allows an authorized attacker to elevate privileges locally.
- Record
EUVD-2026-100035- 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
- 2026-11-10
GitHub AdvisoriesGHSA-9268-6277-cgg6
Heap-based buffer overflow in Windows Direct Composition allows an authorized attacker to elevate...
Heap-based buffer overflow in Windows Direct Composition allows an authorized attacker to elevate privileges locally.
- Record
GHSA-9268-6277-cgg6- 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-122
- Updated
- 2026-11-02
NVD
Heap-based buffer overflow in Windows Direct Composition allows an authorized attacker to elevate privileges locally.
- Record
CVE-2026-83903- 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-122
- Updated
- 2026-11-02
Affected products
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.
In short
CVE-2026-83903 is a high vulnerability (CVSS 7.8) in Microsoft Windows 11 Version 24h2, published October 13, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.38%, the 32nd percentile. No source names a fixed version.