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CVE-2026-62918Critical

Microsoft Teams Spoofing Vulnerability

MSRC advisory NVD CVE.org

Assessment

Improper verification of cryptographic signature in Microsoft Teams allows an unauthorized attacker to perform spoofing over a network.

Severity
Critical
CVSS base score
7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C
Impact
Spoofing
EPSS, next 30 days
0.5%Higher than 40% of scored CVEs · FIRST model run 26 Sep 2026 · about EPSS
Exploitability
Not assessed
Publicly disclosed
No
Customer action
Not required (service-side fix)
Component
Microsoft Teams
Weakness
CWE-347: Improper Verification of Cryptographic Signature
Issued by
Microsoft
Published
6 Aug 2026 · August 2026
Last revised
6 Aug 2026

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

Microsoft Office
1 affected product
  • Microsoft Teams
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