CVE-2026-44803
Windows Graphics Component Remote Code Execution Vulnerability
Integer overflow or wraparound in Windows Win32K - GRFX allows an unauthorized attacker to execute code locally.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Windows Graphics Component Remote Code Execution Vulnerability
Integer overflow or wraparound in Windows Win32K - GRFX allows an unauthorized attacker to execute code locally.
- Record
CVE-2026-44803- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Weakness
- CWE-190
- Updated
- 2026-11-02
EUVDEUVD-2026-35758
Integer overflow or wraparound in Windows Win32K - GRFX allows an unauthorized attacker to execute code locally.
- Record
EUVD-2026-35758- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-9978-hjf6-vg85
Integer overflow or wraparound in Windows Win32K - GRFX allows an unauthorized attacker to...
Integer overflow or wraparound in Windows Win32K - GRFX allows an unauthorized attacker to execute code locally.
- Record
GHSA-9978-hjf6-vg85- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Weakness
- CWE-190
- Updated
- 2026-11-02
NVD
Integer overflow or wraparound in Windows Win32K - GRFX allows an unauthorized attacker to execute code locally.
- Record
CVE-2026-44803- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Weakness
- CWE-190
- Updated
- 2026-11-02
Affected products
- microsoft excel
- microsoft excel for android
- microsoft powerpoint for android
- microsoft word for android
- microsoft powerpoint
- microsoft windows 10 version 1607
- microsoft windows 10 version 1809
- microsoft windows 10 version 21h2
- microsoft windows 10 version 22h2
- microsoft windows 11 version 23h2
- microsoft windows 11 version 24h2
- microsoft windows 11 version 25h2
Show 21 moreShow less
- 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 23h2
- microsoft windows 11 24h2
- microsoft windows 11 25h2
- microsoft windows 11 26h1
- microsoft word
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-44803 is a high vulnerability (CVSS 7.8) in Microsoft Excel, published June 9, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.52%, the 44th percentile. No source names a fixed version.