After specifically crawling sites for password leaks in May 2021, the researchers also found 52 websites in which third parties, including the Russian tech giant Yandex, were incidentally collecting password data before submission. The group disclosed their findings to these sites, and all 52 instances have since been resolved.
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Here's the research paper where this was disclosed:
Leaky Forms: A Study of Email and Password Exfiltration Before Form Submission https://homes.esat.kuleuven.be/~asenol/leaky-forms/leaky-forms-usenix-sec22.pdf
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