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Vulnerability Details :

CVE-2026-21527

Summary
Assigner-microsoft
Assigner Org ID-f38d906d-7342-40ea-92c1-6c4a2c6478c8
Published At-10 Feb, 2026 | 17:51
Updated At-10 Apr, 2026 | 13:21
Rejected At-
Credits

Microsoft Exchange Server Spoofing Vulnerability

User interface (ui) misrepresentation of critical information in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:microsoft
Assigner Org ID:f38d906d-7342-40ea-92c1-6c4a2c6478c8
Published At:10 Feb, 2026 | 17:51
Updated At:10 Apr, 2026 | 13:21
Rejected At:
▼CVE Numbering Authority (CNA)
Microsoft Exchange Server Spoofing Vulnerability

User interface (ui) misrepresentation of critical information in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

Affected Products
Vendor
Microsoft CorporationMicrosoft
Product
Microsoft Exchange Server 2016 Cumulative Update 23
Platforms
  • x64-based Systems
Versions
Affected
  • From 15.01.0.0 before 15.01.2507.066 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Microsoft Exchange Server 2019 Cumulative Update 14
Platforms
  • x64-based Systems
Versions
Affected
  • From 15.02.0.0 before 15.02.1544.039 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Microsoft Exchange Server 2019 Cumulative Update 15
Platforms
  • x64-based Systems
Versions
Affected
  • From 15.02.0.0 before 15.02.1748.043 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Microsoft Exchange Server Subscription Edition RTM
Platforms
  • x64-based Systems
Versions
Affected
  • From 15.02.0.0 before 15.02.2562.037 (custom)
Problem Types
TypeCWE IDDescription
CWECWE-451CWE-451: User Interface (UI) Misrepresentation of Critical Information
CWECWE-345CWE-345: Insufficient Verification of Data Authenticity
CWECWE-1286CWE-1286: Improper Validation of Syntactic Correctness of Input
Type: CWE
CWE ID: CWE-451
Description: CWE-451: User Interface (UI) Misrepresentation of Critical Information
Type: CWE
CWE ID: CWE-345
Description: CWE-345: Insufficient Verification of Data Authenticity
Type: CWE
CWE ID: CWE-1286
Description: CWE-1286: Improper Validation of Syntactic Correctness of Input
Metrics
VersionBase scoreBase severityVector
3.16.5MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21527
vendor-advisory
patch
Hyperlink: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21527
Resource:
vendor-advisory
patch
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:secure@microsoft.com
Published At:10 Feb, 2026 | 18:16
Updated At:11 Feb, 2026 | 21:41

User interface (ui) misrepresentation of critical information in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Primary3.16.5MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Type: Primary
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CPE Matches

Microsoft Corporation
microsoft
>>exchange_server>>Versions before 15.02.2562.037(exclusive)
cpe:2.3:a:microsoft:exchange_server:*:*:*:*:subscription:*:*:*
Microsoft Corporation
microsoft
>>exchange_server>>2016
cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_23:*:*:*:*:*:*
Microsoft Corporation
microsoft
>>exchange_server>>2019
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_14:*:*:*:*:*:*
Microsoft Corporation
microsoft
>>exchange_server>>2019
cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_15:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-345Primarysecure@microsoft.com
CWE-451Primarysecure@microsoft.com
CWE-1286Primarysecure@microsoft.com
CWE ID: CWE-345
Type: Primary
Source: secure@microsoft.com
CWE ID: CWE-451
Type: Primary
Source: secure@microsoft.com
CWE ID: CWE-1286
Type: Primary
Source: secure@microsoft.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21527secure@microsoft.com
Vendor Advisory
Hyperlink: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21527
Source: secure@microsoft.com
Resource:
Vendor Advisory

Change History

0
Information is not available yet

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