Kirill Firsov
@k_firsov
Founder and Chairman of @FearsOff | Protecting the World’s Top Crypto Exchanges & Financial Institutions | Cybersecurity Enthusiast
My research on CVE-2025-49113 is out. fearsoff.org/research/round…. Happy reading! #CVE #roundcube #poc @FearsOff
The exploit for CVE-2025-49113 is already available for sale on the dark web. I feel sorry for anyone who hasn’t upgraded to the newest version yet. Doomsday is coming, believe me. #roundcube #CVE @FearsOff
Here is a PoC demonstration for you guys! #roundcube #cve #fearsoff youtu.be/TBkTbMJWHJY
🚨 Coinbase Breach = Bug Bounty Reality Check 🚨 Yesterday, bribed support agents leaked about 1% of @coinbase users’ personal identifying information (PII). • Criminals demanded $20 M. • Coinbase's CEO @brian_armstrong refused—but matched the demand as a $20M bounty for…
🥈 Scored the 2nd-highest bounty on @Hacker0x01 and broke into the Top 10 leaderboard three times in the past 30 days! Huge thanks to @cryptocom for trusting us with their security—now, back to hunting. 🐛🚀 #BugBounty #EthicalHacking #Cybersecurity
🚨 Another Major Milestone Unlocked! 🚨 We’re proud to announce that FearsOff has officially claimed the #1 spot on @Official_Upbit Top Hackers leaderboard — and the #1 Most Valued Hacker (MVH) ranking on PatchDay, the platform powering Upbit’s bug bounty program. For context,…