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CVE-2026-26137

CRITICAL CVSS 3.1: 9.9 EPSS 0.04%
Updated Mar 27, 2026
Microsoft
Parameter Value
CVSS 9.9 (CRITICAL)
Type CWE-918 (Server-Side Request Forgery (SSRF))
Vendor Microsoft
Public PoC No

Server-side request forgery (ssrf) in Microsoft Exchange allows an authorized attacker to elevate privileges over a network.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
Low
Partial disruption

CVSS Vector v3.1

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Microsoft 365_Copilot_Chat
cpe:2.3:a:microsoft:365_copilot_chat:-:*:*:*:*:*:*:*