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High severity · published Aug 11, 2026
CVE-2026-62877
Windows Win32k Elevation of Privilege Vulnerability
7.8
CVSS
0.3%
EPSS
No
On KEV
Description
Stack-based buffer overflow in Windows Win32K 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 16.112.26090911 · source: vendor
MO
Microsoft Office LTSC for Mac 2021 · Microsoft
16.0.1 before 16.112.26090911 · source: vendor
MO
Microsoft Office LTSC for Mac 2024 · Microsoft
16.0.0 before 16.112.26090911 · source: vendor
MO
Microsoft Office for Android · Microsoft
16.0.1 before 16.0.20430.20000 · source: vendor
W1
Windows 10 1607 · Microsoft
before 10.0.14393.9418; before 10.0.14393.9418 · source: NVD
W1
Windows 10 1809 · Microsoft
before 10.0.17763.9115; before 10.0.17763.9115 · source: NVD
W1
Windows 10 21h2 · Microsoft
before 10.0.19044.7663; before 10.0.19044.7663; before 10.0.19044.7663 · source: NVD
W1
Windows 10 22h2 · Microsoft
before 10.0.19045.7663; before 10.0.19045.7663; before 10.0.19045.7663 · source: NVD
W1
Windows 11 23h2 · Microsoft
before 10.0.22631.7517; before 10.0.22631.7517 · source: NVD
W1
Windows 11 24h2 · Microsoft
before 10.0.26100.9106; before 10.0.26100.9106 · source: NVD
W1
Windows 11 25h2 · Microsoft
before 10.0.26200.9106; before 10.0.26200.9106 · source: NVD
W1
Windows 11 26h1 · Microsoft
before 10.0.28000.2704; before 10.0.28000.2704 · source: NVD
Affected product
MO
Microsoft Office 365 for Mac
Microsoft
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-62877
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-62877
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62877
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