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Penetration testing · AI & MCP security · Website hardening

We find your security gaps before someone else does.

For software teams that have to prove security to a major customer, for companies running AI agents, Copilot or MCP servers, and for businesses whose website or shop has to be secure. Every finding verified by hand and evidenced, within a scope agreed in writing.

A personal reply, usually within 24 hours.

3 in 1
Test, secure and prove it, from one team
Fixed price
per engagement, confirmed in writing after the first call
Weeks
Results in weeks, not quarters
Publicly verifiable · reported under coordinated disclosure, fixed by the maintainers · See all findings →
·CVE-2026-15583 Grafana MCP Server
·CVE-2026-114123 d365fo-mcp-server
·CVE-2026-104776 mcp-server-kubernetes
·CVE-2026-110787 pREST
Where to start

Where are you right now?

Security is no longer a once-a-year audit. Customers and regulators want it proven continuously.
Why CyberSec42 exists
How we work
·Fixed price per engagement, confirmed in writing after the first call.
·One fixed point of contact, not an army of juniors.
·A result you can hand over, not billed hours.
·Weeks, not quarters.
The problem

Suddenly you have to prove security. And no one on the team knows how.

A big customer sends a security questionnaire before signing, or asks for a pentest. Your team connects AI agents to real data, or your website finally needs to be properly secured. Without a security team of your own, this quickly becomes a deal-blocker. And an automated scan report is not enough: it prints a number, but no evidence your customer's procurement can work with.

What we take off your plate

Three things that belong together. From one team.

So you don't have to build a security team: we test your software and AI with real pentests, secure the gaps and deliver the evidence you pass on. One fixed point of contact, a fixed price per engagement, clear results.

Test

A real penetration test, carried out by hand, not just an automated scan. We find the gaps in your software, cloud and AI/MCP systems and show them as clear findings your developers can fix.

Secure

We sort the findings by real risk and help you close the gaps, explained plainly, without jargon. So your software becomes provably safer, not just on paper.

Evidence

Report, questionnaire answers and retest that you pass on to customers. For formal compliance projects we work with partners.

Our specialty

The most dangerous layer is the one almost no one tests.

Your company wires AI agents, copilots and MCP servers into your systems: into data, inboxes, files, payments, internal tools. Every one of those connections is a new way in. A poisoned tool call or an over-broad permission, and the agent does what the attacker wants.

Classic pentests and ISO audits rarely touch this layer. We test it specifically, and our findings there are publicly documented.

Prompt injection & tool poisoning Over-broad agent permissions MCP servers & connections Data exfiltration via tools
Data Email Payments MCP server Internal tools Files AI agent !
What sets us apart

Verified by hand, a fixed price per engagement, evidence you can pass on.

Who tests

You talk to Lucas Weber, founder of CyberSec42, and he runs your assessment himself. Focus areas: penetration testing, AI and MCP security, and website hardening. His findings in open-source MCP servers are publicly documented, including CVE-2026-15583. See the findings →

01 / by hand

Reviewed by hand, not just by a tool.

A scanner reports hundreds of false positives. We review every finding by hand, sort by real risk and explain it so your developers can fix it.

every finding reviewed by handsorted by real risk
02 / predictable

Fixed scope, a fixed price per engagement, results in weeks.

No open-ended consulting contract, no surprise on the invoice. You know up front what you get and what it costs, and you have it in weeks, not quarters.

fixed price, in writing after the first callweeks, not quartersone point of contact
03 / evidence

Results your customer and your auditor can work with.

You don't get the adjective "secure", you get evidenced findings, ready-made answers for security questionnaires and proof per requirement. And whatever is still open, we say so clearly.

finding → evidence → retestready-made questionnaire answers
What you get in the end

Not a vague opinion. A proof pack you can pass on.

After the review you have everything in hand to show your customer or your investor that you are secure, instead of just claiming it.

Test report with all findings, sorted by risk and explained clearly.
A report to pass on, structured the way procurement at large customers reviews it.
Ready-made answers for security questionnaires, so your next deal doesn't stall on them.
Evidence per requirement, mapped to what your customer asks for.
A concrete action plan and a retest confirming the gaps are closed.
PROOF PACK
Security assessment · result
AI agents & MCPfixed
Web & APIfixed
Access & permissionsfixed
Secrets & dataverified
Findings can be mapped to requirements, e.g. from:NIS2ISO 27001EU AI Act
Verified · evidence attached
Sample illustration
After the test

You get the report, a prioritized list for your developers and a retest that confirms the fix.

01

Report

Every finding with evidence, sorted by risk and explained clearly.

02

Prioritized list

What your developers fix first, with concrete guidance per finding.

03

Retest

We test the fix again and record the result in writing.

How we work with you

Clear outcomes. Not vague consulting.

Clearly defined services, from a first quick check to ongoing support. Each is scoped to your product and priced individually. Pick the entry point, the path to more is built in.

AI & MCP security

For teams shipping AI agents or MCP servers with real permissions. We check what your tools are allowed to do and where the trust boundaries are, the path from prompt injection to tool abuse, how credentials are handled and the runtime guardrails.

To the service page →

Deep review of critical functions

Some functions simply must not fail, such as encryption, access separation or billing. We review these with special care, every finding backed by traceable evidence rather than a mere claim.

Scoped individually · on request

Ready for your first major customer

The fast way to become credible for a big customer. Security check, trust-page draft, prepared questionnaire answers, evidence register, action plan and a 30/60/90-day roadmap.

To the service page →

Ongoing security support

Security goes stale the moment the first review is over. A monthly cadence of risk checks, evidence and retests keeps your security posture current, with clear reporting for management.

Scoped individually · on request

Consulting & compliance

Preparation for NIS2, ISO 27001, ISO 42001 and the EU AI Act. We find the gaps and build controls and evidence. For formal compliance projects we work with partners.

To the service page →

Manage external assessments

When you need an outside pentest or a formal audit, we define the scope, manage the delivery and fold the findings back into your ongoing support.

Scoped individually · on request
Who it's for

For SMEs, startups and scale-ups without a security team of their own.

SaaS & software vendorsAI agents & copilotsLegalTech & HealthTech FinTechFirst major-customer questionnaireInvestor reviewNIS2 / EU AI ActSensitive customer data
The first step

A free 30-minute call

No slides. We look at your real situation, tell you where you stand on security and compliance and what the most sensible next step is. Honestly, even if it is: you don't need us right now.

Step 1
Intro call, understand your situation, define the scope.
Step 2
We test, secure and prepare the evidence.
Step 3
Retest until clean, proof pack, hand-off to you.
Fixed price per engagement
Confirmed in writing after the first call. Scoped to your product and architecture, no packages and no surprises.
Book a free call
Straight answers

The questions companies ask us most.

Aren't we too small for this?

No. The scope follows what you actually run, whether that is a single web application, an online shop or a connected AI agent. If a test doesn't make sense for you yet, we tell you so in the first call.

How much effort is it for us?

Little. You name a contact person, provide test accounts and join the closing meeting. We take care of everything else.

Do I need my own security team for this?

No, that's exactly why we exist. We take on securing, testing and compliance and deliver results your developers can act on directly. You need no department of your own and no expensive individual consultants.

Do you also test our AI agents and MCP servers?

Yes, that's our specialty. We test exactly the layer classic pentests and ISO audits rarely touch: what your agents are allowed to do, where prompt injection and tool poisoning strike, and whether a permission is scoped too broadly.

Is this a penetration test?

A pentest is part of it. We test your systems like an attacker, but go further: we secure, prepare the compliance evidence and keep supporting you, instead of dropping a report and disappearing.

What does it cost?

Fixed price per engagement, confirmed in writing after the first call. We scope it to your product instead of billing open consulting hours. The first call is free.

Do you issue a certificate?

No, and we don't pretend to. We are your security and compliance partner and prepare everything so the official certification, such as ISO 27001, goes smoothly through the accredited body. Whatever is still open, we say clearly.

Secure and provable,
without your own security team.

In a free intro call we tell you where you stand and what the best next step is. Honestly, even if you don't need us right now.