Security November 2026 CVE-2026-88239
Heap-based buffer overflow in Windows Biometric Service allows an authorized attacker to elevate privileges locally.
Severity Important
CVSS base score 7.8
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:L/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 Windows Biometric Service
Weakness CWE-122: Heap-based Buffer Overflow
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 LowAC:L
Privileges required LowPR:L
User interaction NoneUI:N
Scope UnchangedS:U
Confidentiality HighC:H
Integrity HighI:H
Availability HighA:H
8 KBs KB Type Restart Applies to Known issues Other CVEs KB5122871 Security Update Required Windows Server 2025, Windows Server 2025 (Server Core installation) Resolved USB audio devices might fail to start or produce no sound All CVEs in KB5122871 KB5122876 Security Update Required Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019 and 1 more Resolved USB audio devices might fail to start or produce no sound All CVEs in KB5122876 KB5122878 Security Update Required Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 21H2 for x64-based Systems and 3 more Resolved USB audio devices might fail to start or produce no sound All CVEs in KB5122878 KB5122880 Security Update Required Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 Version 23H2 for x64-based Systems Resolved USB audio devices might fail to start or produce no sound All CVEs in KB5122880 KB5122882 Security Update Required Windows Server 2022, Windows Server 2022 (Server Core installation) Resolved USB audio devices might fail to start or produce no sound All CVEs in KB5122882 KB5123099 Security Update Required Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows Server 2016 and 1 more Resolved USB audio devices might fail to start or produce no sound All CVEs in KB5123099 KB5124008 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 1 more Resolved USB audio devices might fail to start or produce no sound Resolved Domain-joined devices might lose their secure trust relationship with the domain All CVEs in KB5124008 KB5124012 Security Update Required Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems Resolved USB audio devices might fail to start or produce no sound Resolved Domain-joined devices might lose their secure trust relationship with the domain All CVEs in KB5124012
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-2026-88239 . The catalog has a separate collection scope from Microsoft release records.
cve-program · CVE-2026-88239 Published Windows 10 Version 1607 Vendor product
Original vendor version evidence · not evaluated as a NuGet range {
"vendor": "Microsoft",
"product": "Windows 10 Version 1607",
"platforms": [
"32-bit Systems",
"x64-based Systems"
],
"versions": [
{
"version": "10.0.14393.0",
"lessThan": "10.0.14393.9512",
"versionType": "custom",
"status": "affected"
}
]
} Windows 10 Version 1809 Vendor product
Original vendor version evidence · not evaluated as a NuGet range {
"vendor": "Microsoft",
"product": "Windows 10 Version 1809",
"platforms": [
"32-bit Systems",
"x64-based Systems"
],
"versions": [
{
"version": "10.0.17763.0",
"lessThan": "10.0.17763.9245",
"versionType": "custom",
"status": "affected"
}
]
} Windows 10 Version 21H2 Vendor product
Original vendor version evidence · not evaluated as a NuGet range {
"vendor": "Microsoft",
"product": "Windows 10 Version 21H2",
"platforms": [
"32-bit Systems",
"ARM64-based Systems",
"x64-based Systems"
],
"versions": [
{
"version": "10.0.19044.0",
"lessThan": "10.0.19044.7725",
"versionType": "custom",
"status": "affected"
}
]
} Windows 10 Version 22H2 Vendor product
Original vendor version evidence · not evaluated as a NuGet range {
"vendor": "Microsoft",
"product": "Windows 10 Version 22H2",
"platforms": [
"32-bit Systems",
"ARM64-based Systems",
"x64-based Systems"
],
"versions": [
{
"version": "10.0.19045.0",
"lessThan": "10.0.19045.7725",
"versionType": "custom",
"status": "affected"
}
]
} Windows 11 version 23H2 Vendor product
Original vendor version evidence · not evaluated as a NuGet range {
"vendor": "Microsoft",
"product": "Windows 11 version 23H2",
"platforms": [
"ARM64-based Systems"
],
"versions": [
{
"version": "10.0.22631.0",
"lessThan": "10.0.22631.7582",
"versionType": "custom",
"status": "affected"
}
]
} Windows 11 Version 23H2 Vendor product
Original vendor version evidence · not evaluated as a NuGet range {
"vendor": "Microsoft",
"product": "Windows 11 Version 23H2",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "10.0.22631.0",
"lessThan": "10.0.22631.7582",
"versionType": "custom",
"status": "affected"
}
]
} 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": "10.0.26100.9445",
"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": "10.0.26200.9445",
"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": "10.0.28000.2954",
"versionType": "custom",
"status": "affected"
}
]
} Windows Server 2016 Vendor product
Original vendor version evidence · not evaluated as a NuGet range {
"vendor": "Microsoft",
"product": "Windows Server 2016",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "10.0.14393.0",
"lessThan": "10.0.14393.9512",
"versionType": "custom",
"status": "affected"
}
]
} Windows Server 2016 (Server Core installation) Vendor product
Original vendor version evidence · not evaluated as a NuGet range {
"vendor": "Microsoft",
"product": "Windows Server 2016 (Server Core installation)",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "10.0.14393.0",
"lessThan": "10.0.14393.9512",
"versionType": "custom",
"status": "affected"
}
]
} Windows Server 2019 Vendor product
Original vendor version evidence · not evaluated as a NuGet range {
"vendor": "Microsoft",
"product": "Windows Server 2019",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "10.0.17763.0",
"lessThan": "10.0.17763.9245",
"versionType": "custom",
"status": "affected"
}
]
} Windows Server 2019 (Server Core installation) Vendor product
Original vendor version evidence · not evaluated as a NuGet range {
"vendor": "Microsoft",
"product": "Windows Server 2019 (Server Core installation)",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "10.0.17763.0",
"lessThan": "10.0.17763.9245",
"versionType": "custom",
"status": "affected"
}
]
} Windows Server 2022 Vendor product
Original vendor version evidence · not evaluated as a NuGet range {
"vendor": "Microsoft",
"product": "Windows Server 2022",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "10.0.20348.0",
"lessThan": "10.0.20348.5622",
"versionType": "custom",
"status": "affected"
}
]
} Windows Server 2025 Vendor product
Original vendor version evidence · not evaluated as a NuGet range {
"vendor": "Microsoft",
"product": "Windows Server 2025",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "10.0.26100.0",
"lessThan": "10.0.26100.33438",
"versionType": "custom",
"status": "affected"
}
]
} Windows Server 2025 (Server Core installation) Vendor product
Original vendor version evidence · not evaluated as a NuGet range {
"vendor": "Microsoft",
"product": "Windows Server 2025 (Server Core installation)",
"platforms": [
"x64-based Systems"
],
"versions": [
{
"version": "10.0.26100.0",
"lessThan": "10.0.26100.33438",
"versionType": "custom",
"status": "affected"
}
]
} Original source record · Cite this exact observation · Complete original publisher JSON