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High severity · published Jun 9, 2026
CVE-2026-44803
Windows Graphics Component Remote Code Execution Vulnerability
7.8
CVSS
0.5%
EPSS
No
On KEV
Description
Integer overflow or wraparound in Windows Win32K - GRFX allows an unauthorized attacker to execute code locally.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ME
Microsoft Excel for Android · Microsoft
16.0.0.0 before 16.0.20131.20024 · source: vendor
MP
Microsoft PowerPoint for Android · Microsoft
16.0.0.0 before 16.0.20131.20024 · source: vendor
MW
Microsoft Word for Android · Microsoft
16.0.0.0 before 16.0.20131.20024 · source: vendor
W1
Windows 10 Version 1607 · Microsoft
10.0.14393.0 before 10.0.14393.9234 · source: vendor
W1
Windows 10 Version 1809 · Microsoft
10.0.17763.0 before 10.0.17763.8880 · source: vendor
W1
Windows 10 Version 21H2 · Microsoft
10.0.19044.0 before 10.0.19044.7417 · source: vendor
W1
Windows 10 Version 22H2 · Microsoft
10.0.19045.0 before 10.0.19045.7417 · source: vendor
W1
Windows 11 Version 24H2 · Microsoft
10.0.26100.0 before 10.0.26100.8655 · source: vendor
W1
Windows 11 Version 25H2 · Microsoft
10.0.26200.0 before 10.0.26200.8655 · source: vendor
W1
Windows 11 version 23H2 · Microsoft
10.0.22631.0 before 10.0.22631.7219; 10.0.22631.0 before 10.0.22631.7219 · source: vendor
W1
Windows 11 version 26H1 · Microsoft
10.0.28000.0 before 10.0.28000.2269 · source: vendor
WS
Windows Server 2012 · Microsoft
6.2.9200.0 before 6.2.9200.26132 · source: vendor, NVD
Affected product
ME
Microsoft Excel for Android
Microsoft
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44803
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-44803
Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44803
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