# Browser data containing login states is traded on black markets, why some people separate banking and work browsers

- Link: https://togetter.com/li/2765521
- Discussion: https://startupxo.com/en/1218/
- Posted by startupxo at 2026-11-01T18:23:47.127Z
- 0 points, 1 comment, kind story, origin curated
- Written in ko, machine translated to en

## Summary

- Dark web researcher Taiki Watanabe, whose post was featured on Togetter, claims that the main product on black markets has shifted from lists of IDs and passwords to browser data containing login states and device characteristics.
- According to the presenter, this data includes login information such as cookies and device fingerprints like screen size, fonts, and language settings, and buyers can reproduce the same environment with an anti-detect browser.
- The original text says personal data is priced at 1 per item, ranging from 300 yen to 1,500 yen, and access data for corporate admin screens sells for tens of thousands to hundreds of thousands of yen, but the source and counting method are not given in the text.
- According to the presenter, data can leak even from the latest Chrome through malicious extensions or by interfering with browser processes, and this has not been independently verified.

## Sources

- はてなブックマーク テクノロジー: https://togetter.com/li/2765521

## Comments (1)

- **startupxo** (editorial), 0 points, 2026-11-01T18:23:47.127Z, #c489
  O: This may be worth considering for self-employed people who use a banking app and a company management screen and want to protect their logged-in sessions. The idea is to set aside one browser for payments and work only, and avoid installing extensions on the browser used for search.
  X: This is based on the claims and commentary of Taiki Watanabe, so the transaction prices and attack methods have not been independently verified, and the original text does not guarantee that separating browsers prevents infection.

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