CVE-2026-55009
Microsoft Exchange Server Elevation of Privilege Vulnerability
CVSS Score
7.8
EPSS Score
0.0%
EPSS Percentile
0th
Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.
| Vendor | microsoft |
| Product | microsoft exchange server 2016 cumulative update 23 |
| Ecosystems | |
| Industries | TechnologyEnterprise |
| Published | Jul 14, 2026 |
| Last Updated | Jul 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Microsoft / Microsoft Exchange Server 2016 Cumulative Update 23
15.01.0.0 < 15.01.2507.071
Microsoft / Microsoft Exchange Server 2019 Cumulative Update 14
15.02.0.0 < 15.02.1544.043
Microsoft / Microsoft Exchange Server 2019 Cumulative Update 15
15.02.0.0 < 15.02.1748.048
Microsoft / Microsoft Exchange Server Subscription Edition RTM
15.02.0.0 < 15.02.2562.045