Microsoft Exchange Server Spoofing Vulnerability

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Summary

CVECVE-2026-21527
StatePUBLISHED
Assignermicrosoft
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-02-10 18:16:35 UTC
Updated2026-06-15 19:15:15 UTC
DescriptionUser interface (ui) misrepresentation of critical information in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

Risk And Classification

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

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

EPSS: 0.094570000 probability, percentile 0.947990000 (date 2026-06-21)

Problem Types: CWE-345 | CWE-451 | CWE-1286 | CWE-451 CWE-451: User Interface (UI) Misrepresentation of Critical Information | CWE-345 CWE-345: Insufficient Verification of Data Authenticity | CWE-1286 CWE-1286: Improper Validation of Syntactic Correctness of Input

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

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Microsoft Exchange Server 2016 cumulative_update_23 All All
Application Microsoft Exchange Server 2019 cumulative_update_14 All All
Application Microsoft Exchange Server 2019 cumulative_update_15 All All
Application Microsoft Exchange Server Subscription Edition All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 affected 15.01.0.0 15.01.2507.066 custom x64-based Systems
CNA Microsoft Microsoft Exchange Server 2019 Cumulative Update 14 affected 15.02.0.0 15.02.1544.039 custom x64-based Systems
CNA Microsoft Microsoft Exchange Server 2019 Cumulative Update 15 affected 15.02.0.0 15.02.1748.043 custom x64-based Systems
CNA Microsoft Microsoft Exchange Server Subscription Edition RTM affected 15.02.0.0 15.02.2562.037 custom x64-based Systems

References

ReferenceSourceLinkTags
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21527 [email protected] msrc.microsoft.com Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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