Device Code Flow — An Attack Vector That Bypasses MFA
How attackers exploit Microsoft's own legitimate authentication protocol to bypass MFA and gain long-term access to organizational data — and how to protect yourself.
Cybersecurity is essential to organizational trust and resilience.
I'm Holger Rünkaru – a cybersecurity expert with a technical background, helping organizations align security with business objectives.
I help organizations see cybersecurity holistically – understanding technical risks, business impact, and accountability. My experience ensures that security strategies don't just exist on paper, but work in practice.
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20-min video call, no strings attached
Experience
9+ years
Education
TalTech MSc
Certifications
CISSP, 3x GIAC
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I talk about cybersecurity in a language leaders understand. Not technical details, but responsibility, risks, and choices that actually make a difference. My goal is to help make decisions that keep the business running even when something goes wrong. I also explain cybersecurity to employees in a clear and accessible way – why certain rules and practices exist, and which everyday habits help everyone operate more securely.