CVE-2026-62877
Windows Win32k Elevation of Privilege Vulnerability
Stack-based buffer overflow in Windows Win32K 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 Win32k Elevation of Privilege Vulnerability
Stack-based buffer overflow in Windows Win32K allows an authorized attacker to elevate privileges locally.
- Record
CVE-2026-62877- 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-121
- Updated
- 2026-11-02
EUVDEUVD-2026-56399
Stack-based buffer overflow in Windows Win32K allows an authorized attacker to elevate privileges locally.
- Record
EUVD-2026-56399- 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
- 2026-11-02
GitHub AdvisoriesGHSA-4rqg-xw8g-5x6w
Stack-based buffer overflow in Windows Win32K allows an authorized attacker to elevate privileges...
Stack-based buffer overflow in Windows Win32K allows an authorized attacker to elevate privileges locally.
- Record
GHSA-4rqg-xw8g-5x6w- 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-121
- Updated
- 2026-11-02
NVD
Stack-based buffer overflow in Windows Win32K allows an authorized attacker to elevate privileges locally.
- Record
CVE-2026-62877- 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-121
- Updated
- 2026-11-02
Affected products
- microsoft office 365 for mac
- microsoft office for android
- microsoft office ltsc for mac 2021
- microsoft office ltsc for mac 2024
- 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
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-2026-62877 is a high vulnerability (CVSS 7.8) in Microsoft Office 365 For Mac, published August 11, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.33%, the 26th percentile. No source names a fixed version.