CVE-2026-69375: Microsoft Exchange Server Tampering Vulnerability
Published Sep 8, 2026
·Updated
Authorization bypass through user-controlled key in Microsoft Exchange Server allows an authorized attacker to perform tampering over a network.
Other sources
Microsoft Exchange Server Tampering Vulnerability
— Microsoft
Affected Software
8 affected componentsFixes available
Microsoft Exchange Server 2019=14
15.02.1544.046
Microsoft Exchange Server 2016=23
15.01.2507.073
Microsoft Exchange Server Subscription Edition RTM<15.02.2562.049
15.02.2562.049
Microsoft Exchange Server 2019=15
15.02.1748.051
Microsoft Exchange Server=2016-cumulative_update_23
Microsoft Exchange Server=2019-cumulative_update_14
Microsoft Exchange Server=2019-cumulative_update_15
Microsoft Exchange Server Subscription Edition<15.02.2562.049
Remediation
Event History
Sep 8, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeaknessAffected Software
CVE Published
via MITRE·05:12 PM
Data Sourced
via MITRE·05:12 PM
DescriptionSeverity
Data Sourced
via NVD·06:18 PM
RemedyDescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
Which Exchange Server deployments are listed as affected?
Microsoft Exchange Server 2016, Microsoft Exchange Server 2019, and Microsoft Exchange Server Subscription Edition RTM are listed.
2
Does exploitation require authentication or user interaction?
The attacker must be authorized and requires low privileges. The vector is network-based, exploitation complexity is low, and no user interaction is required.
3
What is the expected security impact?
The reported impact is high on integrity, meaning an attacker can perform tampering. No confidentiality or availability impact is indicated.