An LLM application is more than a model — it's prompts, plugins, APIs, data stores and the code wiring them together. We assess the whole system against the OWASP Top 10 for LLM Applications plus classic web and API flaws, for Cyprus businesses.
We test where AI-specific and traditional vulnerabilities meet, which is where real incidents happen.
Beyond the checklist, llm application penetration testing is about understanding how a real attacker would abuse prompt injection & output handling and insecure plugin & tool integration in your specific environment. We map your real environment, not a generic template, then test every path where trust is granted and every place where controls could be bypassed.
The result is clarity: a prioritised, exploitable-risk view of your llm application attack surface that your team can act on immediately, backed by proof rather than a scanner's guesswork.
The businesses that rely on us understand that untested systems are unquantified risk. A weakness that reaches customer or financial data can trigger a GDPR, the EU AI Act and NIS2 obligation, damage hard-won client trust, and stall deals while security questionnaires go unanswered. Our llm application penetration testing exists to remove that uncertainty before an attacker — or an auditor — finds the gap first.
By proving exactly what is exploitable and what it would cost, we turn a vague worry into a concrete, fundable remediation plan. Cyprus firms use our reports to close real gaps, satisfy CySEC, GDPR and NIS2 expectations, and demonstrate genuine due diligence to clients, partners and insurers — with a free retest to prove the fixes hold.
What we test
Prompt injection & output handling
Insecure plugin & tool integration
Sensitive information disclosure
Excessive agency & over-permissioning
Traditional web/API flaws in the stack
Model denial-of-service & cost abuse
Common vulnerabilities we uncover
Prompt injection and insecure output handling
Insecure plugin and tool integration
Sensitive information disclosure
Excessive agency and over-permissioning
Model denial-of-service and cost abuse
Classic web/API flaws in the surrounding stack
How we run your engagement
Kick-off & scoping. A short call to agree goals, in-scope assets and rules of engagement, so your llm application penetration testing is safe, authorised and aimed at your real business risk.
Mapping & discovery. Before touching anything we map the full attack surface in scope, so nothing exploitable slips through.
Hands-on testing. Cyprus-based specialists exploit and chain weaknesses manually — the flaws scanners walk straight past — to show genuine impact.
Reporting. Each issue is verified, CVSS-rated and documented with a step-by-step reproduction and a practical fix your team can apply.
Free retest. Once you have remediated, we re-test at no extra cost to confirm the attack path is truly closed.
Tools & techniques
In practice, your llm application penetration testing focuses on prompt injection & output handling, insecure plugin & tool integration and sensitive information disclosure and the ways they can be chained together.
We test AI systems against the OWASP LLM Top 10 and current agentic-attack research. Adversarial prompt-generation tooling widens coverage, but the decisive work is manual: crafting injection and jailbreak payloads, chaining an LLM's tool and data access into real actions, and probing the boundary between trusted instructions and untrusted content. We treat the model, its prompts, its retrieval sources and its tools as one attack surface.
Every confirmed issue is reproduced with the exact prompt or input sequence, and rated by the concrete action an attacker could force — data exfiltration, unauthorised tool use or privilege escalation — not by abstract model behaviour.
When you need this engagement
You are deploying, changing or relying on systems where prompt injection & output handling would be business-critical
Your AI can browse, run code, or call internal APIs and tools
You use retrieval-augmented generation over sensitive or proprietary documents
You need to satisfy GDPR or EU AI Act expectations for a deployed AI system
You want assurance before exposing an AI assistant to untrusted user input
What you receive
Full-stack LLM app findings
OWASP LLM Top 10 coverage
Reproducible PoCs & remediation
Free retest after remediation
Your deliverables
When your llm application penetration testing wraps up, you receive a clear, audit-ready report plus a walkthrough call with your team. Inside you will find:
A concise executive summary that management and the board can act on
Every technical finding with a reproducible, copy-paste proof of concept
CVSS v3.1 ratings and plain-language business impact for each issue
Practical, prioritised remediation your developers can implement straight away
A free retest and updated finding status once fixes are in place
A signed attestation letter for clients, auditors, GDPR, NIS2 and ISO 27001
Standards & frameworks
OWASP Top 10 for LLM ApplicationsOWASP Web/API Top 10NIST AI RMFMITRE ATLAS
What you gain
By the end of your llm application penetration testing, you will know exactly which weaknesses a real attacker could exploit, what it would cost your business, and the precise order in which to fix them — backed by evidence, not a scanner’s guesswork. Cyprus firms use our findings to close critical gaps, satisfy client and regulator security questionnaires, and demonstrate due diligence for GDPR and NIS2. With a free retest included, you also get documented proof the issues are resolved.
Working with us
Every llm application penetration testing begins with a short, no-obligation scoping call to understand your goals, environment and constraints, followed by a fixed-price proposal. Most work is delivered remotely, and because we are based in Cyprus we work in your timezone with on-site visits across Limassol, Nicosia and island-wide where it helps. We keep you updated throughout and flag any critical finding immediately rather than waiting for the report. Everything is covered by a signed NDA and safe, non-disruptive testing that protects your production systems. You receive your report, a walkthrough and a complimentary retest once fixes land. Engagements are typically booked one to three weeks ahead, and urgent testing can often be arranged — just email hi@cypruspentest.com.
Why Cyprus businesses choose CyprusPentest
Your llm application penetration testing is run by senior offensive-security specialists who test the way genuine attackers do — manually, creatively and focused on proving real impact. What sets us apart:
Based in Cyprus — local, in your timezone, with on-site coverage across Limassol and Nicosia.
Manual, exploit-led testing that chains vulnerabilities the way an attacker would, well beyond automated scanners.
Reproducible proof for every finding, with copy-paste steps your team can independently verify.
Compliance-ready reporting that supports GDPR, NIS2, ISO 27001 and CySEC expectations.
A free retest so you have documented evidence your fixes actually hold.
Fixed-price and responsive, with a named point of contact from scoping through to retest.
Explore related services
LLM Application Penetration Testing pairs well with our other Cyprus penetration testing services for fuller coverage. You may also want:
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How much does LLM Application Penetration Testing cost?
Every llm application penetration testing in Cyprus is scoped and priced individually, so you pay only for the coverage you need — with no hidden extras. After a short, no-obligation scoping call we send a fixed-price quote, usually within one business day, with clear deliverables, a firm timeline and a complimentary retest included. The price depends on the size and complexity of your environment, so you always know the cost up front before any work begins.
