CVE-2026-26137

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

Score

CVSS 3.1 9.9 Critical

Status

Modified - secure@microsoft.com

Published

2026-03-19

Last modified

2026-06-19

Weaknesses

CWE-918

Affected products

• 365 Copilot Chat (Microsoft)
• Exchange Online (Microsoft)

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26137