Kumela
@hellokbit

Security Researcher · Offensive Security & Vulnerability Research · Bug Bounty

I am a security researcher focused on offensive security and vulnerability research. I identify and responsibly disclose vulnerabilities of every severity, up to and including critical issues, working across public bug bounty programs, private programs, and direct engagements with companies. Much of that work is covered by disclosure agreements, so what is shown here is a small portion of it.

Highlights I can share publicly include a finding on HackerOne's own platform, critical vulnerabilities reported to and resolved by Gebeta and Ethiopian Tender, and a single vulnerability affecting every TGStat domain. Every issue is reported privately first, and nothing appears here until it has been fixed.

View findings HackerOne profile

HackerOne recognition

Hacking Hackers · Oct 2025 Insecticide · Oct 2025 Publish or Perish · Apr 2026

Focus areas

Areas of expertise

How I approach security work, whatever the target.

Offensive security testing

Hands-on testing from an attacker's perspective, adapted to each target and scoped to the risks that matter most to the business.

Vulnerability research

Finding, validating, and chaining weaknesses to show real-world impact, from minor misconfigurations to critical issues.

Attack surface analysis

Mapping what an organization exposes and tracing a single root cause across every system that shares it.

Risk-based assessment

Rating issues by realistic impact and likelihood, so teams know what to fix first and why.

Responsible disclosure

Reporting privately, coordinating with vendors, and confirming fixes before anything is made public.

Clear, actionable reporting

Reproducible steps, accurate severity ratings, and remediation guidance a development team can act on quickly.


Approach

Tools & methodology

I work with the full range of industry-standard security tooling, covering interception and proxying, reconnaissance, fuzzing, scanning, and API testing, and I choose what fits each target rather than relying on a fixed toolset. Where off-the-shelf tools fall short, I write custom scripts and automation. Tools find leads; manual testing and a close reading of how the application behaves are what turn them into confirmed, well-documented findings.


Disclosures

Disclosed findings

Vulnerabilities I have reported and confirmed as resolved. Detailed write-ups are available on request, and the public report is linked below.

HIGH
GraphQL DoS via mutation aliasing
HackerOne · GraphQL API · Apr 2026
✓ Resolved · disclosed
MEDIUM
Reflected XSS + Cloudflare WAF bypass
TGStat (11 domains) · returnUrl · Dec 2025
✓ fixed & rewarded
PRIVATE
More findings on private programs
Reported under terms that don't allow public disclosure
Confidential

Experience

Direct engagements

Beyond public bounty programs, I have worked directly with product teams to identify and resolve security issues before they reach users.

Internship

Gebeta

Security intern. Tested the platform and reported critical vulnerabilities, which the team resolved before they could affect users.

Helped secure

Ethiopian Tender

Identified and reported critical access-control and account-takeover vulnerabilities, and supported the team through remediation.


Contact

Get in touch

For security engagements, vulnerability disclosure coordination, or collaboration, please reach out by email.