Security November 2026 CVE-2026-83894
Use after free in RPC Runtime allows an authorized attacker to elevate privileges locally.
Severity Important
CVSS base score 7.0
Impact Elevation of Privilege
Exploitation detected No known exploitation (MSRC assessment)
Exploitability Exploitation Less Likely
Publicly disclosed No (MSRC assessment)
EPSS · 30-day forecast No EPSS score collected
Customer action Required: follow the MSRC remediation guidance More details
CVSS vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Public detection template No Nuclei template is listed in the current collected catalog
Component RPC Runtime
Weakness CWE-416: Use After Free
Issued by Microsoft
Last revised 10 Nov 2026 CVSS 3.1 base metrics Red raises the risk · green lowers it
Attack vector LocalAV:L
Attack complexity HighAC:H
Privileges required LowPR:L
User interaction NoneUI:N
Scope UnchangedS:U
Confidentiality HighC:H
Integrity HighI:H
Availability HighA:H
2 KBs KB Type Restart Applies to Other CVEs KB5127646 Security Update Required Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems All CVEs in KB5127646 KB5127648 Security Update Required Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems and 3 more All CVEs in KB5127648
Source. This summary comes from MSRC's public CVRF document for November 2026. If the MSRC page is blocked in your browser, the NVD and CVE.org records carry the same identifier. None of this says whether your devices are affected.
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Explore global source statements, affected packages and advisory history for CVE-2026-83894 . The catalog has a separate collection scope from Microsoft release records.
cve-program · CVE-2026-83894 Published Windows 11 Version 24H2 Vendor product
Original vendor version evidence · not evaluated as a NuGet range {
"vendor": "Microsoft",
"product": "Windows 11 Version 24H2",
"platforms": [
"ARM64-based Systems",
"x64-based Systems"
],
"versions": [
{
"version": "10.0.26100.0",
"lessThan": "10.0.26100.9711",
"versionType": "custom",
"status": "affected"
}
]
} Windows 11 Version 25H2 Vendor product
Original vendor version evidence · not evaluated as a NuGet range {
"vendor": "Microsoft",
"product": "Windows 11 Version 25H2",
"platforms": [
"ARM64-based Systems",
"x64-based Systems"
],
"versions": [
{
"version": "10.0.26200.0",
"lessThan": "10.0.26200.9711",
"versionType": "custom",
"status": "affected"
}
]
} Windows 11 version 26H1 Vendor product
Original vendor version evidence · not evaluated as a NuGet range {
"vendor": "Microsoft",
"product": "Windows 11 version 26H1",
"platforms": [
"ARM64-based Systems",
"x64-based Systems"
],
"versions": [
{
"version": "10.0.28000.0",
"lessThan": "10.0.28000.3231",
"versionType": "custom",
"status": "affected"
}
]
} Windows 11 Version 26H2 Vendor product
Original vendor version evidence · not evaluated as a NuGet range {
"vendor": "Microsoft",
"product": "Windows 11 Version 26H2",
"platforms": [
"ARM64-based Systems",
"x64-based Systems"
],
"versions": [
{
"version": "10.0.26300.0",
"lessThan": "10.0.26300.9711",
"versionType": "custom",
"status": "affected"
}
]
} Original source record · Cite this exact observation · Complete original publisher JSON