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.
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 Prompt Injection Testing
- 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.
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 ATLAS
NIST 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:
- AI Agent Penetration Testing — AI agent penetration testing in Cyprus. Tool-abuse, goal-hijack and sandbox-escape testing for Cyprus companies deploying autonomous…
- RAG Pipeline Security Assessment — RAG security assessment in Cyprus. Vector-store poisoning, leakage and access-control testing for Cyprus AI knowledge-base products.
- LLM Jailbreak & Guardrail Testing — LLM jailbreak and guardrail testing in Cyprus. Systematic safety-control and content-filter bypass testing for Cyprus AI…
Frequently asked questions
What is indirect prompt injection?
Malicious instructions hidden in content the model reads — a web page, PDF or tool result — the most dangerous variant for agents.
Do you test our RAG pipeline too?
Yes, and we offer a dedicated RAG security assessment for retrieval-specific attacks.
Do you provide mitigations?
Yes — layered controls, then a retest to confirm they hold.