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lacrl lacrl

@lacrllacrl

Penetration tester on HackerOne who chained a Host-header flaw into a Tucows fix and documents 130+ attack techniques.

Serbia
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On HackerOne, I investigate public programs across fintech, crypto, and enterprise SaaS, taking findings from reconnaissance through demonstrated impact. Tucows fixed my Medium-severity Host-header injection report, and I confirmed the fix with a retest; PagerDuty triaged another finding.

My work focuses on combining low-severity weaknesses into full compromise. In TryHackMe challenges, I have chained techniques across web applications, Linux, Active Directory, AWS, and binary exploitation, completing 111 challenges up to insane difficulty.

I maintain a written methodology of more than 130 attack techniques and build Python tools for bot-protected recon, JavaScript bundle mining, traffic capture, and multi-step flow testing. I hold the TryHackMe PT1 certification, scored 946/1000, and write reports with reproducible proof of concept, severity scoring, and layered remediation.

Experience

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Education

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TryHackMe

PT1 Junior Penetration Tester, Penetration Testing

Grade: 946/1000

Completed the PT1 Junior Penetration Tester certification with a score of 946/1000, passing a practical exam against a simulated banking client.

Tech stack

Software and tools used professionally

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