Sahin Yesilirmak

Sahin Yesilirmak

Cybersecurity

Passionate about breaking & building secure systems. Bug Bounty Hunter, CTF Player, and Security Researcher exploring the depths of cybersecurity.

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About Me

Current Focus Live

HSLU

BSc Information & Cyber Security

HSLU — Attack Specialist & Penetration Testing

Security Research

Security Research & CTF

Active researcher finding vulnerabilities and participation in CTF competitions

TELC

TELC C1 German Certification

Actively preparing for TELC C1 language certification

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1000+
CTF Challenges
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0
Valid Bug Found
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0
Certifications
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Projects

Vulnerability Research

Responsible disclosure of security vulnerabilities and bug bounty findings.

CVE-2026-***** CWE-918 Webhook SSRF — No URL Validation, Full Response Leak High 88 days left Vendor Fixing
CVE-2026-***** CWE-918 Unauthenticated Server-Side Request Forgery via Prediction API High 30 days left Vendor Fixing
$ CWE-**** Coming soon Low **** Triaging
CVE-2026-***** CWE-918 Webhook SSRF — No URL Validation, Full Response Leak High 88 days left Vendor Fixing
CVE-2026-***** CWE-918 Unauthenticated Server-Side Request Forgery via Prediction API High 30 days left Vendor Fixing
$ CWE-**** Coming soon Low **** **********

Engineer Work Experience

Independent Vulnerability Researcher

Freelance · Self-Employed

2026 – Present

Security Engineer

Swisscom, Switzerland

2024 – 2025

Projects

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CTF Platforms

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372
Labs Completed
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Education & Certifications

Education

Bachelor in Information & Cyber Security

HSLU, Luzern

02.2025 – heute

Schwerpunkt: Attack Specialist & Penetration Testing

ICT Work Integration Program

Powercoders Bootcamp, Bern

03.2023 – 06.2023

Erwarb fundierte Kenntnisse in Web-Sicherheitskonzepten und -methoden

Bachelor of Cinema/TV

Beykent University, Istanbul

09.2012 – 02.2014

Erwarb Kenntnisse in filmischen Techniken, Methoden und Theorien

Currently Pursuing

TELC C1

German Language Certification

75%

Roadmap

CCNA

CPTS

CDSA

OSCP

Completed

Theoriekurs Informatik-Praktikum (TIP)

Lucerne University of Applied Sciences and Arts • Feb 2025

Burp Suite Certified Practitioner

PortSwigger • Sep 2023

CS50cs - Introduction to Cybersecurity

Harvard University • Dec 2023

CS50p - Introduction to Programming with Python

Harvard University • Jan 2022

CS50x - Introduction to Computer Science

Harvard University • Jan 2022

Get In Touch

Let's Connect!

I'm always open to discussing new projects, security research, bug bounty collaboration, or just a friendly chat about cybersecurity.

GitHub

@sahinyes

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LinkedIn

sahinyes

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