About GK Data LLC

Offensive security led by a working researcher.

GK Data LLC is operated by Garrett Kohlrusch, a security researcher focused on web, API, mobile, cloud, and network testing with clear evidence and practical remediation.

GK Data LLC is based in Blaine, Minnesota and serves clients locally and remotely. The company combines hands-on offensive security work with practical website operations support for businesses that need clear ownership, less risk, and better technical decisions.

The security side focuses on real attack paths: access control failures, authentication weaknesses, JavaScript exposure, mobile API behavior, cloud misconfiguration, and chained findings that explain business impact.

The website operations side helps small businesses stabilize WordPress, clean up hosting and domain ownership, improve local credibility, document accounts, and maintain the site without turning every change into a rebuild.

Current credentials

  • CompTIA Security+
  • CompTIA Network+
  • IBM Cybersecurity Analyst Specialization
  • ITIL 4 Foundation

How GK Data works

Clients work directly with the person doing the testing. That keeps scope honest, reporting practical, and recommendations tied to the actual system instead of a generic checklist.

Public research and disclosure work

Public examples include a NASA GLOBE Observer stored XSS case study, an Intigriti challenge bypass analysis, and a blind stored XSS file-upload case study. Company and program names are only used where disclosure is public or otherwise permitted.

Research backgroundResponsible disclosure and bug bounty experience across high-visibility organizations.
Operator-ledScoping, testing, reporting, and remediation discussion stay close to the technical work.
Practical outputFindings are written for action: evidence, impact, reproduction, and fix guidance.

Have a system that needs a closer look?

Send the target type and the concern. GK Data can help scope offensive security testing, remediation validation, or website operations support.