A vulnerability has been identified within Serv-U 15.4 that, if exploited, allows an actor to bypass multi-factor/two-factor authentication. The actor must have administrator-level access to Serv-U to perform this action.
https://www.solarwinds.com/trust-center/security-advisories/CVE-2023-35179
https://support.solarwinds.com/SuccessCenter/s/article/Serv-U-15-4-Hotfix-1?language=en_US