Lumio Learning — A clean security posture before Series B due diligence

Lumio's learning platform had been built at startup speed, prioritising features over hardening. The founders knew their attack surface had grown faster than their security practices, but they had no clear picture of what was actually exposed.

A Series B round was on the table, and the lead investor's due-diligence process included a technical security review. EdTech handles sensitive data on minors, so a weak security posture wouldn't just be a footnote — it could reprice or sink the deal.

Lumio needed an honest, prioritised assessment of their external threat surface, and enough runway to fix the serious issues, before investors started probing.

Korur mapped Lumio's full external threat surface — public endpoints, exposed services, third-party integrations and leaked credentials — and ranked every finding by real-world exploitability rather than raw scanner severity, so the team fixed what mattered first.

The assessment surfaced 18 critical issues, including exposed admin interfaces, outdated dependencies with known CVEs, and misconfigured storage buckets readable without authentication. Each came with a concrete, developer-ready remediation step, not just a generic warning.

We worked alongside Lumio's small engineering team to close every critical finding and re-tested to confirm the fixes, then produced a clear before-and-after report the founders could hand directly to investors as evidence of a managed security posture.