If you suspect that your Facebook account has been compromised, it is recommended to change your password immediately. If you use Facebook as a login to apps like Spotify or Instagram then change the logins. This will prevent the hacker from accessing the third-party apps through your compromised Facebook profile.
A compromised Facebook account can give hackers access to a wealth of personal information. Hackers could use this information for malicious purposes, such as stealing credit card numbers and sending out fake credit card offers or scams that involve phishing. They can also use the hacked account to send spammy messages to friends, or even post on your timeline with your name (as as if you did it yourself).
Hackers are likely to gain access to an account through exploiting a weakness in the Facebook app’s code. A avg zen vs avg free bug in the iOS Facebook app allows hackers to steal cookies, and then steal the “access token” of an iPhone user. These tokens that are digital keys, allow the hackers full control over the user’s Facebook Account, and any other website they visit with their Facebook credentials.
Hackers can also gain access to accounts using brute-force attacks. This technique involves guessing a password, typically the most commonly used ones such as 123456789 or 1234567890. Hackers may also gain access to accounts by scanning compromised credentials. There are several free tools available to scan for stolen data, including the popular website HaveIBeenPwned.