CVE-2026-21535

HIGH

Microsoft Teams - Unauthenticated Information Disclosure via Improper Access Control

Title source: llm
STIX 2.1

Description

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

References (1)

Core 1
Core References

Scores

CVSS v3 8.2
EPSS 0.0009
EPSS Percentile 25.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-284
Status published
Products (2)
Microsoft/Microsoft Teams -
microsoft/teams
Published Feb 19, 2026
Tracked Since Feb 20, 2026