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CRITICAL · 9.9

CVE-2026-26137

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

Vulnerability Description

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

CVSS Score

9.9

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
LOW

Affected Products

VendorProductVersions
Microsoft365 Copilot Chat-

Related Weaknesses (CWE)

CWE-918

References

FAQ

What is CVE-2026-26137?

CVE-2026-26137 is a vulnerability with a CVSS score of 9.9 (CRITICAL). Server-side request forgery (ssrf) in Microsoft Exchange allows an authorized attacker to elevate privileges over a network.

How severe is CVE-2026-26137?

CVE-2026-26137 has been rated CRITICAL with a CVSS base score of 9.9/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-26137?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft 365 Copilot Chat.