This vulnerability (CWE-347) in Microsoft Teams arises from improper verification of cryptographic signatures, which could enable an attacker to spoof communications or data over a network. The CVSS 3.1 base score is 7.5, reflecting network attack vector, low attack complexity, no privileges or user interaction required, and high impact on integrity without affecting confidentiality or availability. Microsoft has published an official fix for this vulnerability, as detailed in their security advisory.

An attacker exploiting this vulnerability can spoof data or communications within Microsoft Teams, potentially misleading users or systems relying on cryptographic signatures for authenticity. The integrity of communications can be compromised, but confidentiality and availability are not impacted. There are no known active exploits in the wild at this time.

Microsoft has released an official fix for CVE-2026-62918. Users and administrators should apply the provided patch as soon as possible to remediate the vulnerability. Since this is not a cloud service, remediation depends on applying the update to affected installations. Refer to the Microsoft security advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62918 for detailed patching instructions.