Improper Access Control in Microsoft Teams by Microsoft
CVE-2026-21535

8.2HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft Teams
Vendor
CVE Published:
19 February 2026

What is CVE-2026-21535?

A security flaw in Microsoft Teams has been identified that allows unauthorized attackers to exploit improper access control mechanisms, potentially disclosing sensitive information over a network. This vulnerability underscores the need for robust security measures to safeguard communication platforms from unauthorized access.

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Deploy the Patch

Affected Version(s)

Microsoft Teams -

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
8.2
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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