All versions of the Zoom Plugin for Microsoft Outlook for MacOS before 5.3.52553.0918 contain a Time-of-check Time-of-use (TOC/TOU) vulnerability during the plugin installation process. This could allow a standard user to write their own malicious application to the plugin directory, allowing the malicious application to execute in a privileged context.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-34413
• https://cwe.mitre.org/data/definitions/367.html
• https://explore.zoom.us/en/trust/security/security-bulletin/