Serious API Security Flaw Now Fixed On, But More Sites Affected

Salt Security, the API security company, has released new threat research fromSalt Labs highlighting several critical security flaws in The now remediated flaws were found in the implementation of the Open Authorization (OAuth) social-login functionality utilised by, which had the potential to affect any users logging into the site through their Facebook accounts.

The OAuth misconfigurations could have allowed for both large-scale account takeover (ATO) on customers’ accounts and server compromise, enabling bad actors to manipulate platform users to gain complete control over their accounts; leak Personal Identifiable Information (PII) and other sensitive user data stored internally by the sites; or perform any action on behalf of the user, such as booking or cancelling reservations and ordering transportation services. The company says these types of flaws could affect many other websites using the social log-in capabilities.

Salt Labs researchers discovered security vulnerabilities in the social login functionality used by, implemented with an industry-standard protocol called OAuth. Popular across websites and web services, OAuth lets users log into sites using their social media accounts, in one-click, instead of via “traditional” user registration and username/password authentication.

“OAuth has quickly become the industry standard and is currently in use by hundreds of thousands of services around the world,” said Yaniv Balmas, VP of Research, Salt Security. “As a result, misconfigurations of OAuth can have a significant impact on both companies and customers as they leave precious data exposed to bad actors. Security vulnerabilities can happen on any website, and as a result of rapid scaling, many organizations remain unaware of the myriad of security risks that exist within their platforms.”

While OAuth provides users with a much easier experience in interacting with websites, its complex technical back end can create security issues with the potential for exploitation. By manipulating certain steps in the OAuth sequence on the site, Salt Labs researchers found they could hijack sessions and achieve account takeover (ATO), stealing user data and performing actions on behalf of users.

Any user configured to log in using Facebook might have been affected by this issue. Given the popularity of using the “log in with Facebook” option, millions of users could have been at risk from this issue. (part of the same parent company, Booking Holdings Inc.) could have also been affected, as it allows users to log in using their credentials, increasing the number of users susceptible to these security flaws by millions.

Upon discovering the vulnerabilities, Salt Labs’ researchers followed coordinated disclosure practices with, and all issues were remediated swiftly, with no evidence of these flaws having been exploited in the wild. made the following statement:

“On receipt of the report from Salt Security, our teams immediately investigated the findings and established that there had been no compromise to the platform, and the vulnerability was swiftly resolved. We take the protection of customer data extremely seriously. Not only do we handle all personal data in line with the highest international standards, but we are continuously innovating our processes and systems to ensure optimal security on our platform, while evaluating and enhancing the robust security measures we already have in place. As part of this commitment, we welcome collaboration with the global security community, and our Bug Bounty Program should be utilized in these instances.”

According to the Salt Security State of API Security Report, Q3 2022, Salt customers experienced a 117% increase in API attack traffic while their overall API traffic grew 168%. The Salt Security API Protection Platform enables companies to identify risks and vulnerabilities in APIs before they are exploited by attackers, including those listed in the OWASP API Security Top 10. The platform protects APIs across their full lifecycle – build, deploy and runtime phases – utilizing cloud-scale big data combined with AI and ML to baseline millions of users and APIs. By delivering context-based insights across the entire API lifecycle, Salt enables users to detect the reconnaissance activity of bad actors and block them before they can reach their objective. The exploits the Salt Labs team performed would have immediately triggered the Salt platform to highlight the attack.

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