The 1E Platform's component utilized the third-party Duende Identity Server, which suffered from an open redirect vulnerability, permitting an attacker to control the redirection path of end users. Note: 1E Platform's component utilizing the third-party Duende Identity Server has been updated with the patch that includes the fix.
https://www.teamviewer.com/en/resources/trust-center/security-bulletins/1e-2024-2001/