CVE-2026-62918 is a cryptographic signature verification vulnerability in Microsoft Teams. The flaw allows an attacker without privileges or user interaction to spoof communications over a network by exploiting improper signature verification. The vulnerability is categorized under CWE-347 (Improper Verification of Cryptographic Signature). The CVSS v3.1 base score is 7.5, reflecting network attack vector, low attack complexity, no privileges required, no user interaction, unchanged scope, no confidentiality impact, high integrity impact, and no availability impact. There is no information on affected versions or available patches.

An attacker can perform spoofing attacks on Microsoft Teams communications, potentially impersonating legitimate entities or messages. This compromises the integrity of communications but does not affect confidentiality or availability. No known exploits are reported in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fixes or patches have been provided in the available data. Until a patch is available, monitor vendor communications for updates.