Modern Cyprus web products increasingly ship as single-page apps built on React, Angular or Vue — which pushes routing, state and sometimes access-control decisions into the browser, while real authority sits in the API behind. Our SPA penetration testing covers both halves: the client-side risks unique to these frameworks, and the API authorization that ultimately protects your customers' data.
The classic SPA mistake is trusting the client: hiding an admin route in JavaScript, enforcing a role only in the UI, or storing a token where any script can read it. We pull apart the front-end bundle, map every API call it makes, and then attack that API directly — because an attacker never uses your polished UI.
Because SPAs shift logic to the browser, teams routinely assume the front-end enforces security when it simply cannot. The result — authorization that evaporates when the API is called directly, and secrets exposed in a public bundle — is exactly the kind of flaw that turns into a GDPR-reportable data leak.
What we test
Client-side access control and hidden functionality
Token storage and JWT handling
DOM-based XSS and client-side injection
API authorization behind the SPA
CORS and cross-origin misconfiguration
postMessage, WebSocket and third-party script risk
Common vulnerabilities we uncover
Broken authorization enforced only client-side
Insecure JWT/token storage and handling
DOM-based and stored XSS
IDOR and mass assignment on the backing API
Permissive CORS enabling data theft
Sensitive data and secrets exposed in JS bundles
How we run your engagement
Kick-off & scoping. A short call to agree goals, in-scope assets and rules of engagement, so your single-page application (spa) 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
We start by treating your JavaScript bundle as documentation: extracting routes, roles, API endpoints and any leaked secrets, then rebuilding the full API surface the SPA talks to. Client-side, we test for DOM XSS, insecure token storage, and access control that exists only in the UI.
Server-side, we attack that API on its own terms — authorization, IDOR, mass assignment and CORS — proving whether the security you think the front-end provides actually holds where it counts.
When you need this engagement
You run a React, Angular or Vue single-page application
Your app is API-driven with client-side routing
You store tokens or sensitive data in the browser
You expose an API consumed by your front-end
You are launching or scaling a modern web app
What you receive
Executive and technical report with evidence
Client-side and API-side findings prioritised
Reproduction steps and remediation guidance
Bundle/secret-exposure review
Attestation letter where required
Complimentary retest after fixes
Your deliverables
When your single-page application (spa) 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 10OWASP ASVSOWASP WSTGJWT/OAuth best practice
What you gain
By the end of your single-page application (spa) 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 single-page application (spa) 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 single-page application (spa) 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
Single-Page Application (SPA) 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 Single-Page Application (SPA) Penetration Testing cost?
Every single-page application (spa) 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.
