Facebook seems to be having a row of things recently. The company initially faced humongous backlash on their implementation of data sharing policies between popular messaging app, WhatsApp, and the larger company. Now, it looks like old wounds are reopening for the company as data from a breach that happened in 2019 has surfaced on forums in hacking forums.

The breach involves over half a million users from over 100 countries with data such as their phone number, emails and even birth date. Malaysia is listed in the countries affected with over 11 million users having been compromised. The breach was first reported by Business Insider. Business Insider has also verified the data in the leak by testing password reset requests. A spokesperson for Facebook has confirmed the data breach. The person also confirmed that the data breach occurred due to vulnerability which was identified and patched back in 2019.

While the data is 2 years old, the fact that it is readily available online at this point is a worrying fact. Data like birthdates, phone numbers and emails can be used to socially engineer scams. In fact, due to the phone numbers being leaked and made readily available, the likelihood in getting scams over SMS and phone calls are heightened.

Acronis Vice President of Cyber Protetction research, Candid Wuest, advises that, in light of the leak, “There is now a higher risk of SMS spam, but also password reset attacks and attacks against other services that use SMS for MFA are now more likely. Users should therefore change from SMS-based MFA service where possible for critical accounts.”

The fact that the leaker has readily made the data available for free can be puzzling. However, according Wuest, “As the leaked data does not contain any passwords or payment card details it is of less value to attackers. Furthermore, at least two third of the data was already available from previous leaks. It is not uncommon to see such data sets being made available for free, as they would not yield much profits on underground site. Such large data sets tend to not stay private for very long anyway.”

The new leak brings into the spotlight the amount of personal data we have available online and especially on social media. It also brings into question Facebook’s privacy policies which govern and protect data stored on their service. What’s even more worrying is the fact that Facebook wasn’t the notifying users, instead, the leak was reported by twitter user Alon Gal who has since been looking at and verifying the data leak. Facebook has only confirmed the occurrence of the breach and has not even notified users that were affected.