Web Application Security TestingEvery release of your web app and APIs, tested by AI agents the way an attacker would.
Web application security testing for security and engineering teams shipping web applications and APIs. Ostorlab logs in, maps the pages and API calls behind your app, and tests access control, business logic and injection on every release.
- Gets in: SSO, MFA and custom login flows
- Looks for: broken access control between users, roles and tenants
- Goes through: the REST and GraphQL APIs behind each page
- Proves: a working exploit you can replay for each AI-agent finding
Trusted by security teams at companies including
Free web app vulnerability scanner
A passive crawl of your web app, checking TLS, security headers and known-vulnerable components, with the report sent by email.
4.8/5 on Gartner Peer Insights SOC 2 Type II report (Security)
Scan a website for free
Where web apps and APIs get attacked
Attackers go after the flows where identity, permissions and data move between the browser and your backend. Here is what Ostorlab tests in each one, on every release.
Authentication and SSO
- The risk
- Flaws in login, SSO, password reset and session handling let an attacker take over accounts.
- What Ostorlab tests
- Logs in with your test accounts through SSO, MFA or custom login flows, and tests session handling, password reset and token logic.
Access control and IDOR
- The risk
- Changing an identifier in a request returns another user's or another tenant's data, or unlocks admin functions.
- What Ostorlab tests
- Replays requests across users, roles and tenants to find broken object-level and function-level authorization.
APIs
- The risk
- Undocumented endpoints, GraphQL introspection and real-time subscriptions widen the attack surface beyond what the interface shows.
- What Ostorlab tests
- Discovers the REST and GraphQL endpoints your app calls and tests them for authorization flaws, excessive data exposure and injection.
Business logic
- The risk
- Workflows such as checkout, sign-up and approvals can be abused when the server trusts the order or content of requests.
- What Ostorlab tests
- AI agents explore multi-step workflows the way an attacker would, looking for steps that can be skipped or tampered with.
Injection
- The risk
- SQL, command and template injection or cross-site scripting let attackers read data, run code or act as your users.
- What Ostorlab tests
- Tests inputs, parameters and headers across authenticated pages and APIs for injection flaws, with request and response evidence for each finding.
Third-party integrations and secrets
- The risk
- API keys and tokens exposed in front-end code, vulnerable libraries and risky third-party scripts give attackers a way in.
- What Ostorlab tests
- Finds secrets in front-end code and traffic, vulnerable open-source components, and malicious or risky third-party code.
Every finding comes with evidence your developers can act on
- Request and response evidenceThe exact traffic that shows the issue
- Step-by-step traceHow the AI agent reached the finding, action by action
- Affected endpointWhere the issue is, with remediation guidance
- Replayable exploitA working exploit you can replay for each AI-agent finding
What each scan tests
The free scan looks at your web app from the outside, without logging in or sending attacks. The paid scans test the running app and the APIs behind login, and prove what an attacker could do.
| What is tested | Free scan | Full Web Scan | Agentic Deep Scan |
|---|---|---|---|
| Crawl of the public pages | |||
| Known-vulnerable components | |||
| Active testing of the running app | – | ||
| Pages and APIs behind login | – | ||
| Business logic testing and vulnerability chaining | – | – | |
| Proof-of-concept exploits | – | – |
Give the URLs of your web apps and APIs. Add test credentials to test behind login, exclude URLs with a regex filter and cap the requests per second.
Key capabilities for web app and API security
The parts of the Ostorlab platform web security and engineering teams ask about most. Each one has its own page with the details.
- Agentic Deep Scan for webReplace manual web and API pentesting with AI agents that test authenticated workflows on every release and prove confirmed findings with exploit evidence.Learn more
- Web authentication testingTest SSO, MFA, one-time codes and custom login flows with your test accounts.Learn more
- API securityTest REST, GraphQL, SOAP and gRPC APIs for authorization flaws, data exposure and injection.Learn more
- Web DASTTest the running application and its authenticated pages for injection, misconfigurations and OWASP Top 10 issues.Learn more
- Secrets detectionFind API keys, tokens and credentials exposed in front-end code, responses and configuration.Learn more
- Software composition analysis and SBOMFind vulnerable open-source components in your web stack and get an SBOM for every release.Learn more
- Malware detectionDetect malicious code, backdoors and risky third-party scripts in your web application.Learn more
- Source code analysisScan your repositories for vulnerable code, secrets and dependencies before they reach production.Learn more
- Attack surface discoveryFind the domains, web apps and APIs your organization exposes, including the ones nobody tracks.Learn more
- On-premises scanningScan staging apps, APIs and repositories behind your firewall or VPN, on infrastructure you control.Learn more
Evidence for your auditors and your customers' security reviews
Ostorlab helps you test your web app and APIs against the security and privacy expectations in the rules your auditors and customers ask about, and gives you reports you can reuse as evidence from one release to the next.
Helps you test against and produce evidence for
- EuropePersonal data protection, cybersecurity for essential and important entities, and security requirements for products with digital elements
- GDPR
- NIS2
- CRA
- United KingdomData protection
- UK GDPR
- United StatesConsumer privacy in California, and health information safeguards where your app holds health data
- CCPA/CPRA
- HIPAA
- Middle EastPersonal data protection and national cybersecurity controls in Saudi Arabia, and personal data protection in the UAE
- Saudi PDPL
- NCA ECC
- UAE PDPL
- AfricaData protection in South Africa and Nigeria
- POPIA
- Nigeria NDPA
- Asia-PacificData protection in Singapore, Japan and India
- Singapore PDPA
- Japan APPI
- India DPDP
- Latin AmericaData protection in Brazil
- LGPD
- Global standardsWeb application security verification, the most critical web risks, payment card security, and evidence for the SOC 2 and ISO 27001 reviews your customers ask about
- OWASP ASVS
- OWASP Top 10
- PCI DSS
- SOC 2
- ISO 27001
Ostorlab's own security
Ostorlab has a SOC 2 Type II report for the Security criteria, covering 18 Nov 2024 – 18 Apr 2025 (the audit for the current period is in progress). Our controls, policies and document requests are in the Trust Center.
Visit the Trust CenterData residency
On the Enterprise plan, choose where your data is hosted.
- United States
- European Union
- GCC
- Asia-Pacific
On-premises
Run scans from inside your network, so non-production apps and APIs never need to be exposed.
About on-premises scanningTrusted by Security Teams Worldwide
Discover why industry experts love working with our platform
Very efficient team, the support engineers are very good and knowledgeable. The product is always evolving and they take customer input very seriously.
A reliable product with unique features and a personalized approach to products.
The platform helped us evaluate our internal mobile applications easily and efficiently. The onboarding was smooth and the UI dynamic automation is great.
The product meets our needs perfectly and is easy to set up and use. The team is very reactive.
Very professional and technical. Five star. Excellent delivery.
We selected Ostorlab as our sole partner in providing mobile applications and web vulnerability scans. We have a very good partnership.
Their customer service is top notch and their product is constantly improving.
Easy to use and getting better with new updates, they are also quick to help and very efficient.
Great product, with amazing customer service, very useful, accurate, and straightforward to use.
Prompt support and personalized features highlighted.
I had a very excellent experience with Ostorlab as a MAST solution.
Very efficient team, the support engineers are very good and knowledgeable. The product is always evolving and they take customer input very seriously.
A reliable product with unique features and a personalized approach to products.
The platform helped us evaluate our internal mobile applications easily and efficiently. The onboarding was smooth and the UI dynamic automation is great.
The product meets our needs perfectly and is easy to set up and use. The team is very reactive.
Very professional and technical. Five star. Excellent delivery.
We selected Ostorlab as our sole partner in providing mobile applications and web vulnerability scans. We have a very good partnership.
Their customer service is top notch and their product is constantly improving.
Easy to use and getting better with new updates, they are also quick to help and very efficient.
Great product, with amazing customer service, very useful, accurate, and straightforward to use.
Prompt support and personalized features highlighted.
I had a very excellent experience with Ostorlab as a MAST solution.
Very efficient team, the support engineers are very good and knowledgeable. The product is always evolving and they take customer input very seriously.
A reliable product with unique features and a personalized approach to products.
The platform helped us evaluate our internal mobile applications easily and efficiently. The onboarding was smooth and the UI dynamic automation is great.
The product meets our needs perfectly and is easy to set up and use. The team is very reactive.
Very professional and technical. Five star. Excellent delivery.
We selected Ostorlab as our sole partner in providing mobile applications and web vulnerability scans. We have a very good partnership.
Their customer service is top notch and their product is constantly improving.
Easy to use and getting better with new updates, they are also quick to help and very efficient.
Great product, with amazing customer service, very useful, accurate, and straightforward to use.
Prompt support and personalized features highlighted.
I had a very excellent experience with Ostorlab as a MAST solution.
Frequently asked questions
Straight answers on coverage, setup, and how results reach your team.
Can't find your answer? Book a demo or contact us.
See how AI agents would test your web app
Book a demo to walk through a web app and API scan with our team and get answers to your security, compliance and vendor-review questions. Or start with a free scan of your web app.