CVE-2026-70279: Microsoft Exchange Server 2016 Cumulative Update 23 15.01.0.0 to before 15.01.2507.077; +3 more affected products

Affected technology

Microsoft Exchange Server 2016 Cumulative Update 23 · 15.01.0.0 to before 15.01.2507.077
Microsoft

Microsoft Exchange Server 2019 Cumulative Update 14 · 15.02.0.0 to before 15.02.1544.050
Microsoft

Microsoft Exchange Server 2019 Cumulative Update 15 · 15.02.0.0 to before 15.02.1748.055
Microsoft

Microsoft Exchange Server Subscription Edition RTM · 15.02.0.0 to before 15.02.2562.056
Microsoft

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · No privileges required · User interaction required

What an attacker can do

An unauthorized attacker can perform spoofing over a network. Vendor/CNA’s CVSS 3.1 assessment (base score 9.3/10) rates confidentiality and integrity impact as high; availability impact as none.