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Sunghyun Jeon

PROFILE

Sunghyun Jeon

Nukunga contributed to the projectdiscovery/subfinder and nuclei-templates repositories by building and enhancing security automation features. He integrated the DigitalYama passive scraping source into subfinder, handling API interactions and response parsing in Go, while improving code hygiene and test coverage. In nuclei-templates, he developed YAML-based vulnerability detection templates for CVEs, including stored and reflected XSS, RCE, and account takeover scenarios, and maintained documentation to support security monitoring. His work included configuration management, code formatting, and documentation cleanup, resulting in broader vulnerability coverage, improved detection accuracy, and maintainable code. Nukunga’s contributions demonstrated depth in Go, YAML, and security testing.

Overall Statistics

Feature vs Bugs

78%Features

Repository Contributions

23Total
Bugs
2
Commits
23
Features
7
Lines of code
2,279
Activity Months4

Work History

September 2025

2 Commits • 1 Features

Sep 1, 2025

September 2025 - projectdiscovery/nuclei-templates: Delivered vulnerability documentation and automated detection templates to enhance security monitoring for CVEs 2025-54123 and 2025-58434. Focused on closing detection gaps and increasing risk visibility.

August 2025

11 Commits • 3 Features

Aug 1, 2025

August 2025: Expanded nuclei-templates security detection coverage with multiple new templates and quality-of-life improvements. Delivered CVE-2025-50738 Stored XSS template for Memos (pre-0.25.0) using headless browsing validation; introduced CVE-2025-54782 RCE detection template for NestJS DevTools with config/matcher refinements to improve accuracy; added Microweber CMS Reflected XSS templates for live_edit.module_settings API and admin page creation; performed YAML formatting and description readability cleanups for CVE-2025-51501 and CVE-2025-51502. These changes broaden vulnerability coverage, enhance detection precision, and improve template maintainability across major frameworks.

February 2025

6 Commits • 2 Features

Feb 1, 2025

February 2025 monthly summary for projectdiscovery/nuclei-templates: Key initiatives include KISA Cloud Vulnerability Inspection Guide for Windows Server with YAML-based checks and remediation, ongoing improvements, and wide YAML cleanup for readability. Completed documentation cleanup, including removal of obsolete files and improvements to account lockout policy verification. Also performed cosmetic YAML cleanup in nuclei-templates to improve readability and maintainability. These efforts reduce manual remediation time, improve security posture for Windows Server deployments, and enhance maintainability of vulnerability templates.

January 2025

4 Commits • 1 Features

Jan 1, 2025

January 2025 review for projectdiscovery/subfinder: Key feature delivered was the DigitalYama passive scraping source integration, including API interaction and response parsing, with the source registered in AllSources and covered by test suites for both default and recursive discovery. Performed code hygiene updates: ensured newline at end of digitalyama.go and removed unused jsoniter import. Enhanced test coverage and CI stability by addressing syntax in digitalyama tests and adding coverage for a RapidApi-related workflow/build test. Overall impact includes expanded data-source coverage, improved discovery reliability, and maintained maintainability across the codebase. Technologies/skills demonstrated include Go, API integration and parsing, test-driven development, CI/test automation, and proactive code quality—and impact-focused development.

Activity

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Quality Metrics

Correctness97.4%
Maintainability97.4%
Architecture95.6%
Performance95.6%
AI Usage20.0%

Skills & Technologies

Programming Languages

GoMarkdownPowerShellYAMLyaml

Technical Skills

API integrationCloud SecurityCode CleanupCode FormattingConfiguration ManagementCross-Site Scripting (XSS)DocumentationDocumentation ManagementExploit DevelopmentFile ManagementGoGo DevelopmentGo developmentNestJSPenetration Testing

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

projectdiscovery/nuclei-templates

Feb 2025 Sep 2025
3 Months active

Languages Used

MarkdownPowerShellYAMLyaml

Technical Skills

Cloud SecurityCode CleanupConfiguration ManagementDocumentationDocumentation ManagementScripting

projectdiscovery/subfinder

Jan 2025 Jan 2025
1 Month active

Languages Used

Go

Technical Skills

API integrationCode CleanupGoGo DevelopmentGo developmentSubdomain enumeration

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