Apps & API Security Testing
Careful, scoped testing of web apps, mobile apps, and REST/GraphQL APIs. We align on timing, scope, and non-disruptive methods so your team can review findings with confidence.
Fixed scope, agreed windows, and controlled testing.
Input Validation & Injection
We start by modeling how attackers probe inputs, then trace how that data moves through parsers, resolvers, and serializers. Appsecco testing validates each boundary with scoped payloads to see where assumptions break without disrupting production traffic.
Example Finding
A search filter accepted raw operators in a GraphQL query, allowing limited record inference beyond the intended query shape. We mapped the exact parsing path and recommended parameterized filters with allowlisted fields.
Authentication & Authorization
We model how attackers move from login to tokens, sessions, and privilege boundaries. Appsecco testing traces each decision point - issuance, storage, refresh, and access checks - to confirm your auth flows enforce identity and tenant isolation as designed.
Example Finding
Refresh tokens were accepted without validating the intended audience, allowing a valid token from one app to access data in another. We documented the exact flow and recommended scoped token audiences with enforced checks.
Business Logic Abuse
We model how a real attacker stitches together legitimate features - reordering steps, skipping gates, and chaining flows that were never designed to connect. Appsecco testing walks each decision path to confirm your product rules hold under out-of-order and edge-case sequences.
Example Finding
An upgrade workflow accepted a step-complete flag before payment confirmation, enabling feature access without charge. We mapped the exact sequence and recommended server-side state validation at each transition.
API Abuse & Protocol Confusion
Attackers look for gaps between API intent and protocol reality - switching verbs, replaying requests, and nudging headers to see what the service actually enforces. Appsecco testing recreates those behaviors with scoped, non-disruptive probes, then traces how your API parses and authorizes each variation.
Example Finding
A sensitive action accepted GET requests alongside POST, which bypassed CSRF protections in a specific route. We documented the parsing path and recommended strict method enforcement with consistent handler validation.
Client-side & JavaScript Risks
Attackers probe the browser runtime because it reveals how data is rendered, stored, and reused. Appsecco testing traces user-controlled input through DOM sinks, template bindings, and storage APIs, then validates CSP, CORS, and content-type handling to confirm the client stays within intended boundaries.
Example Finding
A support note renderer accepted HTML in a preview pane, which flowed into an admin dashboard view and executed as script. We mapped the rendering path and recommended strict sanitization with an allowlist plus CSP hardening.
Enumeration, Rate Limits & Resilience
Attackers map endpoints and automation boundaries before they try to escalate; that behavior is why Appsecco testing pairs route discovery with control validation. We assess hidden routes, GraphQL introspection, and predictable identifiers, then verify rate limits, lockouts, and retry controls so automated probing stays contained.
Example Finding
A password reset endpoint returned different responses for valid and invalid users and lacked per-tenant throttling. We documented the sequence and recommended uniform responses with rate limits keyed by account and IP.
Apps & APIs FAQ
What exactly is in scope for Apps & APIs testing?
We align on specific apps, environments, and endpoints before testing starts. Scope includes web or mobile front-ends plus the APIs they call, with the routes, roles, and data types documented so your team can review coverage clearly.
How do you show evidence for each finding?
Each issue includes a reproducible path, affected endpoints or screens, and the exact condition that failed. We keep steps concise so engineering, security, and audit reviewers can validate the risk and the fix.
What do we receive at the end of the engagement?
You receive a report tailored for product teams: findings with remediation guidance, severity rationale, and an executive summary. We also provide a walkthrough to confirm interpretation and answer questions.
Can you test production systems safely?
When production testing is required, we coordinate windows, rate limits, and non-disruptive techniques with your team. If a staging environment is preferred, we mirror the same scope and confirm any production-only behaviors separately.
Do you retest fixes or help validate remediation?
Yes. We can retest confirmed fixes and document closure with the same evidence-driven format, so internal reviews have a clear before-and-after record.
Safe next step
Review the scope together.
No obligation to proceed.
We can walk through your apps and APIs, confirm testing windows, and share a fixed quote if useful.
Discuss your scopeor view a sample report first