Web Application Penetration Testing
Web application penetration testing
Manual, OWASP-aligned testing of your web application by testers who read code and think like attackers. Part of Atoro’s penetration testing practice.
You get validated findings, an audit-ready report, remediation support, and a retest included to confirm the fixes.
Built for modern software companies · Rated 4.8/5 on G2
Authenticated and unauthenticated testing
OWASP Top 10 and beyond
Human-validated findings
Retest included
Web application penetration test
WEB
APP
Attacker-realistic testingLogged in, cross-role and multi-step: the attacks scanners cannot run.
Access control and logicThe flaw classes where real products actually break.
Validated findingsEvery issue reproduced, rated and explained by a tester.
Audit-ready reportWritten for engineers, auditors and customer reviewers.
Retest includedFixes confirmed, closure evidence provided.
What usually triggers the call
- An enterprise customer wants a recent test before they sign.
- Your ISO 27001 or SOC 2 audit needs vulnerability management evidence.
- Engineering wants a real answer, not another scanner report.
- A major release has changed the application’s risk picture.
- Your last test missed the logic flaws and drowned you in noise.
02 Why this test
Your web app is the front door. Someone should try to open it.
Most companies arrive at web application testing for one of three reasons. An enterprise customer has asked for a recent penetration test before they sign. An ISO 27001 or SOC 2 audit needs evidence that vulnerabilities are found and fixed. Or engineering knows the scanner output is noise and wants a real answer about what an attacker could actually do.
Whatever brought you here, the requirement is the same. You need someone to test the application the way an attacker would use it: logged in, moving between roles, chaining small weaknesses into real impact. A scanner cannot do that. A human tester can.
Client proof
“Atoro was fantastic at finding and testing attack surfaces across our site, generating documentation, and executing testing plans smoothly. Their approach was super easy and truly fantastic, and they helped with best practices around security.”
Scott A., Co-Founder & CEO · 5/5 review on G2, July 2026
03 Coverage
What the test covers
We test the application layer end to end, using the OWASP Top 10 as a floor, not a ceiling. The interesting findings are almost never on a checklist.
Authentication and session management
How users prove who they are, and what happens to that proof. Login flows, password reset, MFA handling, token lifetime, session fixation and logout behaviour. Broken authentication is still one of the most common ways real applications fall.
Access control and business logic
The flaws scanners cannot see. Can a standard user reach admin functions by calling the endpoint directly? Can one customer read another customer’s data by changing an ID? Can a workflow be driven out of order to skip a payment or an approval step? This is where manual testing earns its keep, and where most of our highest-severity findings come from.
Input handling
Injection in all its forms: SQL, command, template and cross-site scripting, tested by hand where it matters, including the places automated tools time out on. We confirm exploitability rather than reporting every reflected parameter as critical.
Single-page applications and modern frontends
Modern frontends move logic into the browser, and with it a set of failure modes older checklists never see. We look at token storage and exposure on the client, CORS configuration that quietly widens the trust boundary, postMessage handlers, and the state the frontend keeps that the backend forgets to re-verify. The test question is always the same: does the server still make its own decisions, or does it trust what the client tells it?
File handling and integrations
Upload features, document previews, import pipelines and the URLs your application fetches on a user’s behalf. We test file-type validation and where uploads actually land, server-side request forgery through fetchers and integrations, and the trust placed in content arriving from third-party services. These features ship late, under deadline, and attackers know it.
How findings are rated
Severity starts from CVSS and is then adjusted for your product’s reality: what data sits behind the flaw, what an attacker can chain it with, and how reachable the path is. A technically minor issue on a critical path outranks a textbook-critical finding nobody can reach, and the report says so plainly.
Where we test
Staging is the default: full coverage without risk to production data or uptime. We test production where a customer or auditor requires it, with rules of engagement agreed in scoping so nothing surprises your on-call engineer.
OWASP is the floor. Your product’s own logic is the ceiling, and that is where we spend the time.
04 Compare
Scan or test? Know what you are buying
| Automated vulnerability scan | Manual penetration test |
|---|---|
| Matches known signatures against your stack | Attacks your application’s actual logic and flows |
| Cannot log in, change roles or chain findings | Tests authenticated, cross-role and multi-step attacks |
| Reports possibles; false positives are yours to triage | Every finding validated, reproduced and severity-rated by a tester |
| No view on business impact | Findings tied to what an attacker gains in your product |
| Fails most enterprise security reviews on its own | Accepted by auditors and customer security teams |
A scan has its place inside a security programme. It is not a penetration test, and your customer’s security team knows the difference. If your product’s data moves through APIs, they deserve their own engagement; to test the whole product as one scope, see SaaS penetration testing.
05 Why Atoro
Why software companies test with Atoro
Human-validated. Always.
Every finding is reproduced and rated by a tester. You will never triage raw scanner output passed off as expert work.
Engineering-led.
Your testers understand modern stacks, single-page apps and API-backed frontends, not just legacy checklists.
Audit-fluent.
One report for two readers: your engineers, who need reproduction steps, and your auditor or customer reviewer, who needs mapped evidence.
Scope before price.
We agree exactly what is being tested before we quote, and you get the number on the first call.
06 Plan
A managed test from scoping to retest
We run the engagement with clear scoping, a defined testing window, and support before and after the test.
1
Scope
We agree the application boundary, environments, roles and rules of engagement, then fix the price.
2
Test
Manual testing of the agreed scope, tool-assisted where it speeds the work, human-driven where it matters.
3
Validate
Every candidate finding is reproduced, rated for severity and stripped of false positives.
4
Report
Validated findings with evidence, impact and remediation guidance, structured for engineers and auditors.
5
Remediate
We walk your team through the findings and support the fixes; we do not just send a PDF and disappear.
6
Retest
Once you have fixed, we confirm it, and you get closure evidence for your audit or customer.
07 Deliverables
What you receive
Every engagement is scoped first and priced to what it covers. You get the number before any agreement, usually on the first call.
Included
Scoping
A clear view of what is in scope, what is out, and what the test needs to prove.
Included
Expert penetration test
Manual and tool-assisted testing by experienced security professionals.
Included
Human validation
Findings reviewed, prioritised, and explained by testers, not exported from a scanner.
Included
Audit-ready report
Structured for engineering teams, auditors, and customer security reviews.
Included
Remediation support
Help for your team to understand and close the findings.
Included
Retest included
Confirms fixes and provides closure evidence.
No raw scanner output sold as a pen test. No vulnerability dump with no priorities. No report that leaves your engineers guessing.
08 Compliance
Evidence for ISO 27001 and SOC 2
A web application penetration test is the standard way software companies evidence technical vulnerability management for ISO 27001 (Annex A 8.8) and the vulnerability identification expectations in a SOC 2 audit.
We scope the test around the control story you need to tell, and the report maps findings to it, so the same engagement satisfies your auditor, your customer’s security team and your own engineers.
09 FAQ
Web application penetration testing FAQs
How long does a web application penetration test take?
Most web application tests run one to two weeks of testing, depending on the size of the application and the number of roles in scope. Scoping fixes the timeline before we start, and reporting follows within days of testing finishing.
Black box, grey box or white box, which do you use?
Grey box is our default for web applications: we test with credentials for each user role, which finds the access-control and logic flaws that matter most, in the time available. Black box (no access) and white box (code-assisted) testing are available where your threat model or your customer’s requirement calls for them.
Do you test in staging or production?
Staging by default, production where the requirement demands it. A staging environment that mirrors production gives full test coverage with zero risk to live data. When production is in scope we agree rules of engagement first, including timing, excluded actions and an emergency contact on both sides.
Is this just an automated scan?
No. Tools assist with coverage, but every finding in your report has been manually reproduced, validated and severity-rated by a tester. You get attacker-realistic findings, not a list of possibles to triage yourself.
What do you need from our team before testing?
Typically: test accounts for each role in scope, a staging environment, a short architecture walkthrough and a named technical contact. Scoping produces a precise checklist, and the ask on your engineers during testing is close to zero.
Does this count as evidence for ISO 27001 or SOC 2?
Yes. The report is structured as audit evidence: findings mapped to the relevant control story, severity and remediation documented, and retest closure included. Auditors and customer security reviewers accept it as it stands.
Will testing disrupt our users or our team?
Testing in staging has no effect on users at all. In production we agree rules of engagement that exclude disruptive techniques, and your team’s involvement is limited to providing access at the start and receiving findings at the end.
How often should we retest?
Annually as a baseline, plus after major changes to the application: a new authentication flow, a big release, an acquisition or a re-platform. Enterprise customers and auditors generally expect to see a test from the last twelve months. A retest of remediated findings is already included in every engagement.
10 Push
Request web application testing pricing
Tell us what you need tested and why. You get a clear scope and a fixed quote before any agreement, usually on the first call.
No raw scan sold as a pen test. No vague “starting from” proposal. No report your engineers cannot use.
We’ll review
What the test is for: product security, ISO 27001, SOC 2, customer review, or a deal
The systems, applications, APIs, and infrastructure in scope
Your timeline and any audit or customer deadline
The reporting format your reviewer or internal team needs
The remediation and retest process
The frameworks you may need next