A press release published on 11 December 2020 has caused a great echo in the IT world. In it, Alaa Abdulridha described how he found serious vulnerabilities in Facebook's subdomains. All of this happened because during home office due to the COVID-19 pandemic, he had plenty of free time left that he wanted to spend productively. Interestingly, while reading the press release, I immediately received a message by clicking on the Twitter link marked in the article that unauthorized people had access to the account I was using, so they suggested to change my password. All of this gave me enough motivation to start exploring the topic in more depth.