If you suspect that your Facebook account has been compromised, you should change your password immediately. Then, if you are using Facebook to log in to apps such as Spotify or Instagram change your logins as well. This will prevent the hacker from accessing these third-party services via your hacked Facebook account.
Hackers can access a wealth of personal data in compromised Facebook accounts. Hackers could use the information for malicious purposes such as spamming people or sending fake credit card offers. Hackers can also use compromised accounts to send spammy messages or to post on your timeline (as in the event that it was you who did it).
One of the most common ways hackers can gain access to an account is to exploit a flaw in Facebook’s app code. A bug in the iOS Facebook application allows hackers to hijack cookies and steal the “access token” of an iPhone user. These tokens are digital keys, allow them full control over the user’s Facebook digital rights management Account, and any other website they access using their Facebook credentials.
Hackers may also gain access to a user’s account by using brute force attacks. This method involves figuring out the password, which is usually the most frequently used ones such as 123456789 or 1234567890. Lastly, hackers can also gain access to an account by sifting through compromised credentials. There are numerous free tools that can be used to search for stolen information, including a popular website called HasbeenPwned.