Microsoft Teams
CVE-2026-21535 — Microsoft Teams Information Disclosure Vulnerability
Executive Summary
Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network.
Overview
8.2
CVSS HIGH
Critical
MS Severity
Not Exploited
MS Exploit Status
Exploitation Unlikely
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
Temporal Score: 7.1
EPSS Score
0.00592
probability of exploitation in the next 30 days
0.4364 percentile - updated 2026-06-20
View on FIRST.org
Affected Products
1 affected product
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft Teams | — |
Critical | Information Disclosure | Unknown |
Patches
1 patch
| Article | Type | Restart |
|---|---|---|
— |
Unknown |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
Stefan Wey with UMB
References
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