Microsoft Exchange Server
CVE-2026-45583 — Microsoft Exchange Server Remote Code Execution Vulnerability
Executive Summary
Improper control of generation of code ('code injection') in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.
Overview
8.1
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.5
EPSS Score
0.0043
probability of exploitation in the next 30 days
0.34211 percentile - updated 2026-06-21
View on FIRST.org
Affected Products
4 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft Exchange Server 2016 Cumulative Update 23 | 5094144 (Security Update) |
Important | Remote Code Execution | Yes |
| Microsoft Exchange Server 2019 Cumulative Update 14 | 5094142 (Security Update) |
Important | Remote Code Execution | Yes |
| Microsoft Exchange Server 2019 Cumulative Update 15 | 5094140 (Security Update) |
Important | Remote Code Execution | Yes |
| Microsoft Exchange Server Subscription Edition RTM | 5094139 (Security Update) |
Important | Remote Code Execution | Yes |
Patches
4 patches
| Article | Type | Restart |
|---|---|---|
5094144 |
Security Update | Yes |
5094142 |
Security Update | Yes |
5094140 |
Security Update | Yes |
5094139 |
Security Update | Yes |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
Anonymous
References
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