Microsoft Exchange Server Tampering Vulnerability

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-69375
StatePUBLISHED
Assignermicrosoft
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-08 18:18:58 UTC
Updated2026-09-11 15:17:02 UTC
DescriptionAuthorization bypass through user-controlled key in Microsoft Exchange Server allows an authorized attacker to perform tampering over a network.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

EPSS: 0.005910000 probability, percentile 0.464060000 (date 2026-09-13)

Problem Types: CWE-639 | CWE-639 CWE-639: Authorization Bypass Through User-Controlled Key

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
3.1CNACVSS6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 affected 15.01.0.0 15.01.2507.073 custom x64-based Systems
CNA Microsoft Microsoft Exchange Server 2019 Cumulative Update 14 affected 15.02.0.0 15.02.1544.046 custom x64-based Systems
CNA Microsoft Microsoft Exchange Server 2019 Cumulative Update 15 affected 15.02.0.0 15.02.1748.051 custom x64-based Systems
CNA Microsoft Microsoft Exchange Server Subscription Edition RTM affected 15.02.0.0 15.02.2562.049 custom x64-based Systems

References

ReferenceSourceLinkTags
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69375 [email protected] msrc.microsoft.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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