Web Application Penetration Testing Manchester

CREST-accredited web application penetration testing for Manchester businesses. We test your websites, portals and APIs the way a real attacker would.

Your web applications are your most exposed systems

Public websites, customer portals, booking and payment systems and APIs are all reachable from anywhere, which makes them the first thing an attacker probes. For most Manchester businesses, a web app is where a breach is most likely to start.

What a web application test covers

We test the way an attacker would, focusing on the high-impact issues in the OWASP Top Ten: injection flaws, broken access controls, authentication weaknesses, exposure of personal data, and insecure APIs and file handling.

Clear, prioritised reporting

You get a plain-English report that rates each issue by severity and tells you exactly what to fix, plus a retest to confirm the fixes worked.

Web application testing in Manchester

Manchester's digital, software and professional services concentration means most organisations here are cloud-first with small physical estates. That usually makes assessment quick, provided every cloud service is actually inside the identity provider, which is the single most common thing we find is not true.

When the test is somebody else's requirement

A good number of first penetration tests at Manchester software, digital and media companies were not the founder's idea. An enterprise customer's security review has stalled the contract, or an investor's technical due diligence has put it on the list, and now there is a date attached. The useful first step is to get the exact wording of the requirement, because it is normally narrower than the panic suggests. "An annual penetration test of the production application by an accredited third party, with evidence of remediation" is something you can scope and plan. "They want security sorted before they sign" is not.

Bring that wording to the scoping call and the call is short. Our usual lead time from agreed scope to testing is two to three weeks, at short notice often within a week, and occasionally two to three days for a contained scope, with no premium charged for the hurry. If the deal date is the real constraint, say so early and see urgent penetration testing.

Your front end is not the security boundary

Most products here are a single page application talking to an API. The screen the user sees is JavaScript running on a machine you do not control, so every check it performs is a suggestion. Anyone can read the bundle, find the roles and feature flags inside it, and call the endpoints themselves with whatever values they choose.

That makes the real test a test of the API, including the parts of it nobody meant to leave reachable:

• Endpoints for features removed from the interface a year ago that still answer requests.
• Older API versions kept running for one customer who has since migrated.
• Internal or admin routes protected only by not being linked from anywhere.
• Debug, health and documentation endpoints that describe the rest of the surface to whoever asks.
• Parameters the interface never sends but the server still accepts.

We map that surface from the JavaScript bundles, from whatever documentation exists, and from watching the application in normal use. If you have a specification file for the API, sending it adds coverage rather than reducing it.

Multi-tenant SaaS and the isolation question

If several customers share one instance, the question the enterprise buyer actually wants answered is whether one tenant can reach another tenant's data. Nothing else in the report will matter to them as much.

Answering it needs two tenants, created the ordinary way, each with its own users and some realistic content. We then work the boundaries: identifiers from one tenant used while authenticated as the other, tenant claims inside tokens altered to see what is trusted, file links that turn out to be shared storage with predictable paths, exports produced by a background job holding wider access than the user who requested them, and search that quietly returns matches from outside the tenant. Sign-up and invitation flows deserve their own look, because attaching a user to the wrong organisation is a common way across the line.

Testing around a release cycle

A penetration test is a snapshot of the build in front of the tester on those dates. Where the product ships twice a week, that needs handling rather than ignoring. Book testing after feature freeze and before the release goes out, so fixes travel with the release instead of becoming hotfixes. Avoid deploying a significant change mid-test, because a finding nobody can reproduce afterwards helps no one. Record the version tested, so the report and the free retest refer to the same thing.

One point on production. If the application sits behind a WAF or has rate limiting in front of it, ask for the tester's source address to be allowlisted for the duration. Otherwise a fair part of the engagement goes on evading a filter rather than testing the application underneath it, and you have paid for days that tell you about the filter's configuration. If you also want assurance that the WAF blocks real attacks, we can test with it in place for a defined window and report that separately.

Choosing between staging and production for a product that is still shipping.

Consideration	Staging	Production
Realism	Only as close as it has been kept; configuration, WAF rules and live integrations are commonly missing	Exactly what your customers use, so nothing has to be assumed
Disruption	Heavier testing is possible because a broken environment affects nobody	Testing is more careful and can be timed outside your busiest hours
Data	Seeded or anonymised records, so no customer data is touched	Real customer data, handled within limits set in the rules of engagement
What it can miss	Anything introduced by production configuration, CDN rules or live third-party integrations	Little, other than the tests we judge too risky to run against a live service

Neither answer is wrong. Where the two environments genuinely match, staging usually buys more depth for the same days. Where staging is a distant relative of production, testing it mainly tells you about staging. Say which you have honestly at the scoping call and we will scope to it, and see how our testing works for the rest of the process.

Common questions

Penetration testing for Manchester organisations

Testing requirements in Manchester usually arrive through enterprise client security questionnaires, and investor or acquirer due diligence. Given the largest digital, software and professional services concentration outside London, alongside substantial manufacturing and logistics, the scope is most often a web application, an external infrastructure range, or both together where a customer has asked for evidence covering everything they can see.

The day count is driven mostly by how many user roles an application has and how much genuinely distinct functionality sits behind them, not by page count. We scope on a call rather than through a form, and the quote is fixed for the scope agreed. Manchester engagements usually run remotely, with an on-site day only where the estate needs it.

Where a Manchester requirement names CREST, check the provider holds accreditation at company level rather than relying on an individual certification: ours is verifiable on the CREST marketplace. See what a penetration test costs for ranges by test type.