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Listed on a ransomware leak site

Sermo

sermo.com

Sermo was listed on the Medusa and BlackBasta leak site on Apr 9, 2024. Brandefense has recorded 2 separate claims against it. Information as of Oct 19, 2026.

Country: United StatesIndustry: Healthcare
Updated continuously · figures as of Oct 19, 2026
Claimed by
Medusa, BlackBasta
First listed
Apr 9, 2024
Claims recorded
2

2 Leak-Site Claims.

MedusaConfirmed claim
Posted on the leak site
Jul 1, 2025
Collected by Brandefense
Jul 11, 2025
Data claimed
Not stated
Leak-site post text, written by the group
Sermo is an exclusive online community for licensed physicians, offering a platform for peer-to-peer collaboration, medical crowdsourcing, and real-time discussion of clinical cases. Sermo provides healthcare professionals with tools to connect globally, share insights, and improve patient care through collective knowledge. Sermo's corporate office is located at 3 Times Square, 12th Floor, New York, NY 10036, United States, and has 450+ employees.
BlackBastaConfirmed claim
Posted on the leak site
Apr 9, 2024
Collected by Brandefense
Jul 11, 2025
Data claimed
Not stated

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Figures as of Oct 19, 2026. Confirmed leak-site claims collected by Brandefense technologies and validated by Brandefense analysts.

Listed on a leak site means a ransomware group has claimed the company; it is not a confirmed breach. To request a correction or removal, contact Brandefense.