CVE-2026-55006 Details
Description
Insufficient granularity of access control in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.
A vulnerability in Microsoft Exchange Server related to insufficient granularity of access control allows an authorized attacker to locally elevate privileges. This issue affects multiple versions of Exchange Server, including the Subscription Edition RTM, Exchange Server 2016 Cumulative Update 23, and Exchange Server 2019 Cumulative Updates 14 and 15.
Users can download the security update for this vulnerability through the Microsoft Update Catalog. Instructions for applying the update are available in the corresponding Knowledge Base articles.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 13, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55006 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1220 | Insufficient Granularity of Access Control | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft exchange server | 2016 cumulative_update_23 2019 cumulative_update_14 2019 cumulative_update_15 |
CPE
Remediation
| |
| microsoft exchange server subscription edition | < 15.02.2562.045 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 24, 2026 | Initial Analysis | [email protected] |
| Jul 15, 2026 | CVE Modified | CISA-ADP |
| Jul 14, 2026 | CVE Modified | CISA-ADP |
| Jul 14, 2026 | New CVE Received | [email protected] |