CVE-2026-21535

Published Feb 19, 2026

Last updated 3 months ago

CVSS high 8.2

Overview

Description
Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network.
Source
secure@microsoft.com
NVD status
Analyzed
CNA Tags
exclusively-hosted-service
Products
teams

Risk scores

CVSS 3.1

Type
Primary
Base score
7.5
Impact score
3.6
Exploitability score
3.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Severity
HIGH

Weaknesses

secure@microsoft.com
CWE-284

Social media

Hype score
Not currently trending

Configurations

Related CVEs

  1. Improper authorization in Microsoft Teams allows an authorized attacker to disclose information over a network.•CVE-2026-33823
  2. AI command injection in M365 Copilot allows an unauthorized attacker to disclose information over a network.•CVE-2026-26133
  3. Concurrent execution using shared resource with improper synchronization ('race condition') in Microsoft Teams allows an authorized attacker to elevate privileges locally.•CVE-2025-49737
  4. Improper handling of insufficient permissions or privileges in Microsoft Teams allows an authorized attacker to elevate privileges over a network.•CVE-2025-49731
  5. A library injection vulnerability exists in Microsoft Teams (work or school) 24046.2813.2770.1094 for macOS. A specially crafted library can leverage Teams's access privileges, leading to a permission bypass. A malicious application could inject a library and start the program to trigger this vulnerability and then make use of the vulnerable application's permissions.•CVE-2024-42004

References

Sources include official advisories and independent security research.