Microsoft Exchange Server
CVE-2026-55006 — Microsoft Exchange Server Elevation of Privilege Vulnerability
Executive Summary
Insufficient granularity of access control in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.
Overview
7.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.8
EPSS Score
No EPSS score available for this CVE.
View on FIRST.orgAffected Products
4 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft Exchange Server 2016 Cumulative Update 23 | 5103215 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft Exchange Server 2019 Cumulative Update 14 | 5103214 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft Exchange Server 2019 Cumulative Update 15 | 5103213 (Security Update) |
Important | Elevation of Privilege | Yes |
| Microsoft Exchange Server Subscription Edition RTM | 5103212 (Security Update) |
Important | Elevation of Privilege | Yes |
Patches
4 patches
| Article | Type | Restart |
|---|---|---|
5103215 |
Security Update | Yes |
5103214 |
Security Update | Yes |
5103213 |
Security Update | Yes |
5103212 |
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
MARIOS GYFTOS
References
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