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OpenAdvisories
High · 8.8 Exploitation more likely Public exploit CVE-2026-96940 EUVD-2026-91771GHSA-q9jh-jffv-9xvh

Microsoft Exchange Server Elevation of Privilege Vulnerability

Published Oct 2, 2026 · Updated Nov 10, 2026 · Assigned by microsoft

Vendor: Microsoft Product: Microsoft Exchange Server 2016 Cumulative Update 23 Product: Microsoft Exchange Server 2019 Cumulative Update 14 Product: Microsoft Exchange Server 2019 Cumulative Update 15 Product: Microsoft Exchange Server Subscription Edition RTM

Description

Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Affected products

VendorProductAffectedFixed
Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 15.01.0.0 – < 15.01.2507.075 15.01.2507.075
Microsoft Microsoft Exchange Server 2019 Cumulative Update 14 15.02.0.0 – < 15.02.1544.048 15.02.1544.048
Microsoft Microsoft Exchange Server 2019 Cumulative Update 15 15.02.0.0 – < 15.02.1748.053 15.02.1748.053
Microsoft Microsoft Exchange Server Subscription Edition RTM 15.02.0.0 – < 15.02.2562.053 15.02.2562.053

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 4

References