A bug in WebKit’s implementation of a JavaScript API called IndexedDB can reveal your recent browsing history and even your identity, according to a blog post shared on Friday by browser fingerprinting service FingerprintJS.
In a nutshell, the bug allows any website that uses IndexedDB to access the names of IndexedDB databases generated by other websites during a user’s browsing session. The bug could allow one website to track other websites the user visits in different tabs or windows, as the database names are often unique and specific to each website. The correct and normal behavior should be that websites can only access their own IndexedDB databases.
In some cases, websites use unique user-specific identifiers in IndexedDB database names. For example, YouTube creates databases that include a user’s authenticated Google User ID in the name, and this identifier can be used with Google APIs to fetch personal information about the user, such as a profile picture, according to FingerprintJS. This personal information could help a malicious actor to determine a user’s identity.
Read more at MacRumors.com