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CVE-2026-83563

Winlogon Elevation of Privilege Vulnerability

7.8 High

CVE-2026-83563 is a high vulnerability (CVSS 7.8) in Microsoft Windows 11 Version 23h2, published November 10, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.46%, the 40th percentile. No source names a fixed version.

What does this mean?
Severity
7.8 HighCVSS 3.1, CVE List
Exploit chance
0.46%EPSS, 40th percentile
Exploitation
None knownNot on CISA’s or ENISA’s lists
Fixed in
No fix listedNo source names one

Description

Heap-based buffer overflow in Winlogon 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

0.46%Unchanged since Nov 11, 2026
90%50%10%1%

Discussion

Quiet in the last day.
14 days ago: 0 people13 days ago: 0 people12 days ago: 0 people11 days ago: 0 people10 days ago: 0 people9 days ago: 0 people8 days ago: 0 people7 days ago: 0 people6 days ago: 0 people5 days ago: 0 people4 days ago: 1 person3 days ago: 0 people2 days ago: 0 people1 day ago: 0 peopleLast 24 hours: 0 people

Affected products

What each source reports

CVE List Score used7.8

Winlogon Elevation of Privilege Vulnerability

Heap-based buffer overflow in Winlogon allows an authorized attacker to elevate privileges locally.

Record
CVE-2026-83563
CVSS 3.1
7.8 HighCVSS: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-122
Updated
2026-11-10
EUVDEUVD-2026-1220667.8

Heap-based buffer overflow in Winlogon allows an authorized attacker to elevate privileges locally.

Record
EUVD-2026-122066
CVSS 3.1
7.8 HighCVSS: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
2026-11-11
GitHub AdvisoriesGHSA-3gh4-mg3m-wcc27.8

Heap-based buffer overflow in Winlogon allows an authorized attacker to elevate privileges locally.

Heap-based buffer overflow in Winlogon allows an authorized attacker to elevate privileges locally.

Record
GHSA-3gh4-mg3m-wcc2
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-122
Updated
2026-11-10
NVD7.8

Heap-based buffer overflow in Winlogon allows an authorized attacker to elevate privileges locally.

Record
CVE-2026-83563
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-122
Updated
2026-11-11

History

History
RecordedChangedSources
publishedEUVD
publishedEUVD, NVD
aliases, referencesGitHub Advisories
cwes, references, severity, titleCVE List
first indexedEUVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

References

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