Ubisoft never shares your login credentials nor provides access to any third parties.
You can see all the successful and unsuccessful login attempts on the Account Management website in the Security Settings tab.
If you see successful connections made on your account that were not from you, it means someone has logged in using your login credentials.
We recommend that you change your password immediately and activate 2-Step Verification to secure your account.
Do not hesitate to contact us if you require any further assistance.