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7.5
Microsoft Teams: Unauthorized Access to Network Information
CVE-2026-21535
Summary
A security weakness in Microsoft Teams allows hackers to access sensitive information on your computer network without permission. This could lead to data theft or unauthorized changes to your system. To protect your network, apply the latest Microsoft Teams updates and ensure your organization's security policies are up to date.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| microsoft | teams | All versions | – |
Original title
Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network.
Original description
Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network.
nvd CVSS3.1
7.5
Vulnerability type
CWE-284
Improper Access Control
Published: 19 Feb 2026 · Updated: 15 Mar 2026 · First seen: 6 Mar 2026