CVE-2026-26137
CRITICALMicrosoft 365 Copilot BizChat Elevation of Privilege Vulnerability
Title source: cnaDescription
Server-side request forgery (ssrf) in Microsoft Exchange allows an authorized attacker to elevate privileges over a network.
References (1)
Core 1
Core References
Vendor Advisory vendor-advisory
patch
Microsoft 365 Copilot BizChat Elevation of Privilege Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26137
Scores
CVSS v3
9.9
EPSS
0.0054
EPSS Percentile
40.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-918
Status
published
Products (3)
microsoft/365_copilot_chat
Microsoft/Microsoft 365 Copilot's Business Chat
-
Microsoft/Microsoft Exchange Online
-
Published
Mar 19, 2026
Tracked Since
Mar 20, 2026