Self-generated SSL certificates are unsafe for several reasons:

Self-signed certificates are not trusted by browsers. When users visit websites that deploy self-signed certificates, they will be warned by the browser and Block access;

Self-signed certificates can be issued at will and are not regulated by international standards. You can sign them yourself, and hackers can also sign the same certificates as you for man-in-the-middle attacks. The protection mechanism of SSL encryption is in name only. .

Self-signed certificates may use outdated standards such as insecure 1024-bit public key algorithms or SHA-1 digest algorithms, which are very easy to crack.

The main purpose of using an SSL certificate is to protect the security of data transmission through the SSL encryption verification mechanism. If a self-signed certificate cannot provide security protection at all, it is best to contact WoSign, a certificate authority trusted by the browser. WoSign applies for an SSL certificate.