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High severity · published Jul 14, 2026
CVE-2026-56176
Windows Win32k Elevation of Privilege Vulnerability
7.8
CVSS
0.3%
EPSS
No
On KEV
Description
Out-of-bounds read in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MO
Microsoft Office 365 for Mac · Microsoft
1.0.0 before 16.111.26071215 · source: vendor
MO
Microsoft Office LTSC for Mac 2021 · Microsoft
16.0.1 before 16.111.26071215 · source: vendor
MO
Microsoft Office LTSC for Mac 2024 · Microsoft
16.0.0 before 16.111.26071215 · source: vendor
MO
Microsoft Office for Android · Microsoft
16.0.1 before 16.0.20228.20042 · source: vendor
W1
Windows 10 Version 1607 · Microsoft
10.0.14393.0 before 10.0.14393.9339 · source: vendor
W1
Windows 10 Version 1809 · Microsoft
10.0.17763.0 before 10.0.17763.9020 · source: vendor
W1
Windows 10 Version 21H2 · Microsoft
10.0.19044.0 before 10.0.19044.7548 · source: vendor
W1
Windows 10 Version 22H2 · Microsoft
10.0.19045.0 before 10.0.19045.7548 · source: vendor
W1
Windows 11 Version 24H2 · Microsoft
10.0.26100.0 before 10.0.26100.8875 · source: vendor
W1
Windows 11 Version 25H2 · Microsoft
10.0.26200.0 before 10.0.26200.8875 · source: vendor
W1
Windows 11 version 26H1 · Microsoft
10.0.28000.0 before 10.0.28000.2525 · source: vendor
WS
Windows Server 2012 · Microsoft
6.2.9200.0 before 6.2.9200.26226 · source: vendor, NVD
Affected product
MO
Microsoft Office 365 for Mac
Microsoft
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-56176
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-56176
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56176
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