CVE-2026-96940

Microsoft Exchange Server Elevation of Privilege Vulnerability

Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate privileges over a network.

Affected

Microsoft · Microsoft Exchange Server 2016 Cumulative Update 23 · Microsoft Exchange Server 2019 Cumulative Update 14 · Microsoft Exchange Server 2019 Cumulative Update 15 · Microsoft Exchange Server Subscription Edition RTM

CVSS v3.1 MICROSOFT

8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

0.48% chance of exploitation in the next 30 days, 40th percentile

Published

2026-10-02

Updated

2026-10-16

Proof-of-concept exploits (1)

• HORKimhab/CVE-2026-969401★ · 2026-10-06

Security advisories

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96940

References

• CVE Record
• NVD entry