Heap-based buffer overflow in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally.

The remote Windows host is missing security update 5073455. It is, therefore, affected by multiple vulnerabilities

  - Untrusted pointer dereference in Windows Cloud Files Mini Filter Driver allows an authorized attacker to     elevate privileges locally. (CVE-2026-20857)

  - An issue was discovered in Broadcom) LSI PCI-SV92EX Soft Modem Kernel Driver through 2.2.100.1 (aka     AGRSM64.sys). There is Local Privilege Escalation to SYSTEM via a Stack Overflow in RTLCopyMemory (IOCTL     0x1b2150). An attacker can exploit this to elevate privileges from a medium-integrity process to SYSTEM.
    This can also be used to bypass kernel-level protections such as AV or PPL, because exploit code runs with     high-integrity privileges and can be used in coordinated BYOVD (bring your own vulnerable driver)     ransomware campaigns. (CVE-2023-31096)

  - Windows Remote Procedure Call Interface Definition Language (IDL) Elevation of Privilege Vulnerability     (CVE-2026-20832)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Windows host is missing security update 5073450. It is, therefore, affected by multiple vulnerabilities

  - Untrusted pointer dereference in Windows Cloud Files Mini Filter Driver allows an authorized attacker to     elevate privileges locally. (CVE-2026-20857)

  - An issue was discovered in Broadcom) LSI PCI-SV92EX Soft Modem Kernel Driver through 2.2.100.1 (aka     AGRSM64.sys). There is Local Privilege Escalation to SYSTEM via a Stack Overflow in RTLCopyMemory (IOCTL     0x1b2150). An attacker can exploit this to elevate privileges from a medium-integrity process to SYSTEM.
    This can also be used to bypass kernel-level protections such as AV or PPL, because exploit code runs with     high-integrity privileges and can be used in coordinated BYOVD (bring your own vulnerable driver)     ransomware campaigns. (CVE-2023-31096)

  - Windows Remote Procedure Call Interface Definition Language (IDL) Elevation of Privilege Vulnerability     (CVE-2026-20832)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
283472	KB5073455: Windows 11 version 23H2 Security Update (January 2026)	Nessus	Windows : Microsoft Bulletins	high
283463	KB5073450: Windows 11 version 22H2 / Windows Server version 23H2 Security Update (January 2026)	Nessus	Windows : Microsoft Bulletins	high

Detections

Analytics

CVE-2026-20876

medium

Tenable Plugins

high

high