CVE-2026-87695
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Privilege Escalation in Microsoft Exchange Server

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Microsoft Corporation

Description
Inclusion of functionality from untrusted control sphere in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.

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Meta Information

Published
2026-10-13
Last Modified
2026-10-13
Generated
2026-10-14
AI Q&A
2026-10-13
EPSS Evaluated
N/A
NVD
CVE-2026-87695
EUVD
EUVD-2026-100144

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 15.01.0.0
Microsoft Microsoft Exchange Server 2019 Cumulative Update 14 15.02.0.0
Microsoft Microsoft Exchange Server 2019 Cumulative Update 15 15.02.0.0
Microsoft Microsoft Exchange Server Subscription Edition RTM 15.02.0.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-829 The product imports, requires, or includes executable functionality (such as a library) from a source that is outside of the intended control sphere.

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Executive Summary

This vulnerability in Microsoft Exchange Server allows an authorized attacker to elevate their privileges locally by including functionality from an untrusted control sphere. This means the attacker can gain higher access rights than intended without needing to exploit remote code execution.

Impact Analysis

An attacker could gain elevated privileges on your Exchange Server, potentially allowing them to access sensitive data, modify configurations, or disrupt services. This could lead to data breaches, unauthorized access, or service disruptions.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, which may violate compliance requirements under GDPR, HIPAA, or other regulations. Organizations may face legal penalties, reputational damage, or loss of certification if such breaches occur.

Mitigation Strategies

Apply the latest security updates from Microsoft for Exchange Server 2016 CU23, 2019 CU14, 2019 CU15, and Subscription Edition RTM. Monitor Microsoft's security advisories for patches and install them promptly.

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