Adobe revealed that hackers had breached its network and (as well as stealing source code) had accessed customer databases including the details of approximately 3 million users. Adobe didnt protect the password data with a one-way cryptographic hashing algorithm. The leaked database included users plaintext password hints, helping to reveal what the most commonly used passwords were. The top 100 most common passwords in the Adobe database were 123456, 123456789 and 446162 j9p+HWTWWTWWT8/HeZN+3oiCQ= 12345678.”]
Source: https://grahamcluley.com/top-50-passwords-adobe-security-breach/