Teams
CVE-2026-21535
HIGH
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
2DescriptionCVE.org
Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network.
AnalysisAI
Microsoft Teams contains an access control vulnerability that enables unauthenticated remote attackers to extract sensitive information without user interaction. The flaw affects Teams deployments and carries a high severity rating, though no patch is currently available. Exploitation requires only network access with no additional prerequisites, making this a significant risk for organizations using the platform.
Technical ContextAI
Classified as CWE-284 (Improper Access Control). Affects Teams. Improper access control in Microsoft Teams allows an unauthorized attacker to disclose information over a network.
RemediationAI
Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.
Privilege elevation in Microsoft Teams lets a remote, unauthenticated attacker gain unauthorized access across a network
Path-traversal-driven remote code execution affects the Microsoft Teams client for Android in all builds prior to 1.0.0.
A library injection vulnerability exists in Microsoft Teams (work or school) 24046.2813.2770.1094 for macOS. Rated criti
A library injection vulnerability exists in the WebView.app helper app of Microsoft Teams (work or school) 24046.2813.27
A library injection vulnerability exists in the com.microsoft.teams2.modulehost.app helper app of Microsoft Teams (work
Privilege elevation in Microsoft Teams allows an authenticated attacker with low-level access to bypass authentication c
Heap buffer overflow in libwebp in Google Chrome prior to 116.0.5845.187 and libwebp 1.3.2 allowed a remote attacker to
Cross-site scripting in Microsoft Teams for Android (versions below 1.0.76.202611302) enables an authenticated attacker
Cryptographic signature spoofing in Microsoft Teams exposes enterprise collaboration environments to unauthenticated ide
The Microsoft Teams online service contains a stored cross-site scripting vulnerability in the displayName parameter tha
Microsoft Teams Remote Code Execution Vulnerability. Rated high severity (CVSS 8.8), this vulnerability is remotely expl
Microsoft Teams Remote Code Execution Vulnerability. Rated high severity (CVSS 8.8), this vulnerability is remotely expl
Same weakness CWE-284 – Improper Access Control
View allShare
External POC / Exploit Code
Leaving vuln.today