MDSec

Adversary-simulation specialists behind the Web Application Hacker's Handbook

Macclesfield, United KingdomFounded 201150-200 peopleEnglishmdsec.co.uk

L2Cross-referenced, highest level reached

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MDSec is a L2-verified AI-implementation provider based in Macclesfield, United Kingdom, delivering red-team, appsec, pentest. Ranked on proof, 1 verified records on the Trustgent index.

What they build

MDSec is a Cheshire-based security consulting and education company whose senior consultants are the authors of the Web and Mobile Application Hacker's Handbook series. The firm is known for offensive tooling, deep adversary simulation and CBEST / STAR-FS / TIBER-EU threat-led red-team engagements for UK banks and financial market infrastructure, alongside application security testing, hardware hacking and incident response. Its training arm delivers 'ActiveBreach' offensive courses used by CREST-registered testers worldwide.

Quick facts

HQ: Macclesfield, United Kingdom
Founded: 2011
Team: 50-200
Languages: English
Stack

Capabilities

Red teaming
Application security
Penetration testing
Incident response

Industries served

Financial services
Manufacturing & industrial
SaaS & technology
Government & public sector

Regulatory readiness

Cross-referenced against public registries where a public source exists (L2+). The check mark marks an attribute we have a source for, see the proof page.

About MDSec

What does MDSec build?

MDSec is a L2-verified AI-implementation provider on Trustgent, delivering Red teaming, Application security, Penetration testing.

Where is MDSec based?

MDSec is headquartered in Macclesfield, United Kingdom.

How is MDSec verified on Trustgent?

MDSec has an EARNED verification level of L2 on Trustgent, with 1 contributing verified records (most recent verification: 2026-07-05). Verification is independent of any subscription, plan tier is never a ranking input.

How is MDSec ranked?

Rank is a pure function of three EARNED signals: verification level (dominant), record count, and recency. No plan, fee, spend, or paid placement is ever an input. See https://trustgent.com/how-we-rank.