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Jelle Ursem

Researcher

I find the passwords and data you're leaking onto the public web before anyone else does

CSIRT cases

  • DIVD-2026-00003 - Mendix Applications – Data Exposure due to Authorization Misconfiguration
  • DIVD-2022-00048 - Dossier Energy Transition
  • DIVD-2022-00017 - Global Healthcare Vulnerabilities
  • DIVD-2022-00009 - SolarMan backend administrator account/password

Other links

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Jelle Ursem

We aim to make the digital world safer by reporting vulnerabilities we find in digital systems to the people who can fix them. We have a global reach, but do it Dutch style: open, honest, collaborative, and for free.

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Ethics at the base of everything we do

Since we handle sensitive data collected without informed consent, we've created this Code of Conduct to establish an ethical foundation for our work. This code can also be utilized by other researchers involved in what is currently known as responsible disclosure or coordinated vulnerability disclosure.

Code of conduct
Scanning from: AS50559 IPv4: 194.5.73.0/24 aka 194.5.73.0-194.5.73.255 - Our own local infrastructure
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