All vulnerabilities discussed in this post have been reported to uBlock Origin and patched. In this post, we'll show you how we were able to bypass these restrictions in uBlock Origin, use a novel CSS-based exploitation technique to extract data from scripts and attributes, and even steal passwords from Microsoft Edge. These lists are not entirely trusted, so they're constrained to prevent malicious rules from stealing user data. ![]() Behind the scenes, they're powered by community-provided filter lists - CSS selectors that dictate which elements to block. ![]() Ad blockers like uBlock Origin are extremely popular, and typically have access to every page a user visits.
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