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Microsoft Teams' Improper Authentication Allows Unauthenticated Remote Attackers to Access the Platform Without Valid Credentials

Last refreshed2026-09-27

Status: UPDATED  |  Advisory ID: CVE-2026-62896

Key Details

CVECVE-2026-62896
CVSS Score / Version9.6 (Critical) / CVSS v3.1
Updated2026-09-20
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
CVSS Proseattack vector is network; attack complexity is low; privileges required is low; user interaction is none; scope is changed; confidentiality impact is high; integrity impact is high; availability impact is none.
Affected productsMicrosoft Teams
Classified asCWE-287 (Improper Authentication)
Exploitation prediction (EPSS)0.69% probability of exploitation in the next 30 days (51% percentile) -- FIRST.org's EPSS model.

Affected Products, Subsystems & Sectors

VendorProductAffected VersionsPatch Status
MicrosoftTeams
SubsystemsGeneral OT
SectorsMultiple

What to Know

Improper authentication in Microsoft Teams allows an authorized attacker to elevate privileges over a network.

What to Do

Monitor Microsoft's web page for any future patch releases. See vendor advisory link below.

References

SourceReference
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-62896
CVEhttps://www.cve.org/CVERecord?id=CVE-2026-62896
Vendor advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62896