CVE-2026-87695

Analyzed Analyzed - Analysis Complete

Privilege Escalation in Microsoft Exchange Server

Publication date: 2026-10-13

Last updated on: 2026-10-27

Assigner: Microsoft Corporation

Description

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

CVSS Scores

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Meta Information

Published

2026-10-13

Last Modified

2026-10-27

Generated

2026-11-08

AI Q&A

2026-10-13

EPSS Evaluated

2026-11-07

NVD

CVE-2026-87695

EUVD

EUVD-2026-100144

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	exchange_server	2016
microsoft	exchange_server	2019
microsoft	exchange_server	2019
microsoft	exchange_server_subscription_edition	to 15.02.2562.056 (exc)

Helpful Resources

Exploitability

CWE

KEV

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.

Attack-Flow Graph

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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