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CVE-2026-26137

Microsoft 365 Copilot - Business Chat

Microsoft CVSS 8.9 Updated March 20, 2026

Executive Risk Summary

"A server-side request forgery (SSRF) vulnerability in Microsoft 365 Copilot's Business Chat allows an authorized attacker to elevate privileges over a network, potentially leading to unauthorized access and data breaches. This vulnerability poses a significant risk to the security and integrity of the affected systems, emphasizing the need for prompt mitigation."

Operational Audit Arsenal

Target Type Software Component
Target Asset Microsoft 365 Copilot
Standard Path %ProgramFiles%\Microsoft 365\Copilot
PowerShell
# 🛠️ Senior Engineer Universal Audit
# Target: Microsoft 365 Copilot (Software Component)
$Targets = 'Microsoft 365 Copilot'
$SearchPaths = @("$env:windir\System32", "$env:ProgramFiles", "${env:ProgramFiles(x86)}")

Get-ChildItem -Path $SearchPaths -Include $Targets -Recurse -ErrorAction SilentlyContinue | 
Select-Object FullName, @{Name="Version";Expression={$_.VersionInfo.ProductVersion}}

Patch Impact Forecast

Reboot Required Likely

Moderate, potential downtime for Microsoft 365 services

Internal Work Notes

CVE-2026-26137: Microsoft 365 Copilot SSRF vulnerability - Request mitigation and patching for affected systems to prevent privilege escalation attacks.

Technical Intelligence & Operational Utilities • Delivered Weekly

Intelligence Sources

Related Microsoft Threats

Data compiled from NVD, MSRC, and CISA KEV Catalog. Intelligence synthesized via AI. Scripts provided for diagnostic purposes under MIT License.