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Vulnerability Details :

CVE-2026-21535

Summary
Assigner-microsoft
Assigner Org ID-f38d906d-7342-40ea-92c1-6c4a2c6478c8
Published At-19 Feb, 2026 | 22:06
Updated At-19 Feb, 2026 | 22:06
Rejected At-
Credits

Microsoft Teams Information Disclosure Vulnerability

Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information 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)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:microsoft
Assigner Org ID:f38d906d-7342-40ea-92c1-6c4a2c6478c8
Published At:19 Feb, 2026 | 22:06
Updated At:19 Feb, 2026 | 22:06
Rejected At:
â–¼CVE Numbering Authority (CNA)
Microsoft Teams Information Disclosure Vulnerability

Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network.

Affected Products
Vendor
Microsoft CorporationMicrosoft
Product
Microsoft Teams
Versions
Affected
  • -
Problem Types
TypeCWE IDDescription
CWECWE-284CWE-284: Improper Access Control
Type: CWE
CWE ID: CWE-284
Description: CWE-284: Improper Access Control
Metrics
VersionBase scoreBase severityVector
3.18.2HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N/E:U/RL:O/RC:C
Version: 3.1
Base score: 8.2
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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-2026-21535
vendor-advisory
patch
Hyperlink: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21535
Resource:
vendor-advisory
patch
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:secure@microsoft.com
Published At:19 Feb, 2026 | 23:16
Updated At:20 Feb, 2026 | 13:49

Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information 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
Primary3.18.2HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Type: Primary
Version: 3.1
Base score: 8.2
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-284Primarysecure@microsoft.com
CWE ID: CWE-284
Type: Primary
Source: secure@microsoft.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21535secure@microsoft.com
N/A
Hyperlink: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21535
Source: secure@microsoft.com
Resource: N/A

Change History

0
Information is not available yet

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