web application security testing
Test the app the way
an attacker sees it.
Web application security testing that runs like a real intruder, not a signature matcher. Proven exploits with the fix, on every deploy. From $49 a month, with the compliance report included.
free to start · no sales call · first exploits in ~10 min
the request that worked
GET /api/orgs/42/invoices Authorization: Bearer <user in org 7> → 200 OK reads another tenant's invoices
Broken tenant isolation (IDOR). Any user can read any org's billing data.
Scope the query to the caller's org in withOrg() before the invoice lookup.
the surface, not the checklist
What actually breaks on a web app.
Auth, access control, injection, business logic, API exposure, and dependencies. The surface an attacker touches, not the list a scanner checks.
Auth and sessions
Login flows, session fixation, token handling, privilege escalation.
Access control and IDOR
Tenant isolation, object-level authorization, horizontal and vertical escalation.
Injection
SQL, command, template, and header injection across every endpoint.
Business logic
Workflow abuse, race conditions, and the flaws code-only tools cannot reach.
API exposure
Shadow endpoints, undocumented routes, and the surface you did not know you shipped.
Dependencies and config
Vulnerable packages, exposed secrets, debug routes, permissive CORS.
scanning vs attacking
Scanners guess. Muster proves.
| Traditional scanner | Muster. | |
|---|---|---|
| How it works | Matches known signatures and CVEs | AI agents form hypotheses about your app and attack it, like a human tester |
| What a finding is | A severity score and a CVE link | A replayed exploit: the exact request, the impact, and the one-line fix |
| Business-logic flaws | Out of reach for signature checks | A core target: roles, workflows, tenant isolation |
| Cadence | Scheduled or on-demand, then stale | Continuous, on every deploy, with re-tests |
| Output | A queue of maybes to triage | Proof, only. If it cannot be exploited, it is not reported |
testing for compliance?
The SOC 2 / ISO 27001 report is included.
Most teams buy a pen test to satisfy an auditor or a customer security review. Muster produces the evidence they ask for as a natural output of the testing, at no extra charge.
Web application security testing, answered.
+What is web application security testing?
Testing a running web app for exploitable vulnerabilities, not just scanning its code. Muster attacks the live app like a real intruder and proves what an attacker can actually exploit, then hands you the fix.
+How is this different from DAST or a vulnerability scanner?
DAST and scanners compare the app to known signatures. Muster forms hypotheses about your specific app, tries them on the live target, and only reports what it proven exploited. Signature matching misses broken access control, business-logic flaws, and workflow abuse.
+Can you test my staging environment?
Yes. You authorize every target, and runs are scoped, rate-limited, and non-destructive. Many teams start on staging before pointing Muster at production.
+How fast do I get results?
First proven findings in about ten minutes. Free to start, no scoping call.
+Does this work for compliance?
Yes. Every proven finding comes with compliance-ready evidence, and the SOC 2 / ISO 27001 report is included at no extra charge.