Detections
Analytics
Microsoft PowerShell 7.4.x < 7.4.22 / 7.5.x < 7.5.13 / 7.6.x < 7.6.9 RCE (CVE-2026-111497)
critical Nessus Plugin ID 374267
Language:
Synopsis
The Microsoft PowerShell install on the remote host is affected by a remote code execution vulnerability.Description
The version of Microsoft PowerShell installed on the remote host is 7.4.x prior to 7.4.22, 7.5.x prior to 7.5.13, or 7.6.x prior to 7.6.9. It is, therefore, affected by a remote code execution vulnerability. An out-of-bounds write in the Brotli decoder used by PowerShell 7 allows an unauthorized attacker to elevate privileges over a network. The issue affects use of Invoke-WebRequest or Invoke-RestMethod against websites without SSL or that the user does not control.Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Upgrade to Microsoft PowerShell version 7.4.22, 7.5.13, 7.6.9, or later.See Also
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-111497
Plugin Details
Severity: Critical
ID: 374267
File Name: smb_nt_ms26_oct_oob_powershell.nasl
Version: 1.1
Type: Local
Agent: windows
Family: Windows : Microsoft Bulletins
Published: 10/30/2026
Updated: 10/30/2026
Supported Sensors: Nessus Agent, Continuous Assessment, Nessus
Risk Information
VPR
Risk Factor: Critical
Score: 9.4
Percentile: 99.83
CVSS v2
Risk Factor: Critical
Base Score: 10
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2026-111497
CVSS v3
Risk Factor: Critical
Base Score: 9.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4
Risk Factor: Critical
Base Score: 9.2
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Vulnerability Information
CPE: cpe:/a:microsoft:powershell
Required KB Items: SMB/Registry/Enumerated, WMI/Windows App Store/Enumerated, installed_sw/Microsoft.PowerShell
Patch Publication Date: 10/25/2026
Vulnerability Publication Date: 10/21/2026
Reference Information
CVE: CVE-2026-111497