Prompt injection is the number-one risk in the OWASP LLM Top 10, and indirect injection through documents and tool output is the variant most teams miss. We probe every untrusted input path that reaches your model, for Cyprus companies shipping AI features.
We demonstrate instruction override, data exfiltration and unauthorised actions, then help you design layered mitigations that hold.
Beyond the checklist, prompt injection testing is about understanding how a real attacker would abuse direct prompt injection and indirect injection via rag & documents 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 prompt injection testing that your team can act on immediately, backed by proof rather than a scanner's guesswork.
In Cyprus, security failures increasingly become regulatory and commercial problems, not only IT ones. 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 prompt injection 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
Direct prompt injection
Indirect injection via RAG & documents
Tool-output & web-content injection
System-prompt extraction & override
Data exfiltration channels
Cross-user & cross-session leakage
Common vulnerabilities we uncover
Direct prompt injection overriding system instructions
Indirect injection via retrieved documents and web content
System-prompt extraction and leakage
Data exfiltration through crafted outputs
Cross-user and cross-session context bleed
Tool-output injection driving unintended actions
How we run your engagement
Kick-off & scoping. A short call to agree goals, in-scope assets and rules of engagement, so your prompt injection 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
A thorough prompt injection testing hinges on direct prompt injection, indirect injection via rag & documents and tool-output & web-content injection, so that is where our manual effort is concentrated.
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 direct prompt injection 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
Injection surface map
Working injection PoCs
Layered mitigation recommendations
Free retest after remediation
Your deliverables
When your prompt injection 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 LLM Top 10 (LLM01)MITRE ATLASNIST AI RMF
What you gain
By the end of your prompt injection 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 prompt injection 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 prompt injection 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
Prompt Injection Testing pairs well with our other Cyprus penetration testing services for fuller coverage. You may also want:
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How much does Prompt Injection Testing cost?
Every prompt injection 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.
