If you suspect your Alibaba.com account was used without consent, follow the guidance provided in this link.
If you can successfully sign in to your account, you can change the password at My Account Change Now.
The password for your Alibaba.com account must meet the following requirements:
6-20 characters;
Use a mix of letters, numbers, and punctuation marks (except spaces);
Include at least 2 types among uppercase letters, lowercase letters, numbers, and punctuation (e.g., AlibabaHello290).