Web Application Penetration Testing Providers
Web application penetration testing is a systematic process of probing web-based applications for security vulnerabilities that could be exploited by attackers. Testers simulate real-world attacks against your web apps, targeting common weaknesses such as SQL injection, cross-site scripting (XSS), authentication bypass, insecure direct object references, and business logic flaws.
This testing follows methodologies like the OWASP Testing Guide and covers the entire application stack including front-end interfaces, APIs, session management, access controls, and server-side logic.
Web app pen testing is essential for organisations that handle sensitive data through online platforms, e-commerce sites, customer portals, or SaaS products. It helps identify vulnerabilities before malicious actors can exploit them, reducing the risk of data breaches, financial loss, and reputational damage. Regular web application penetration testing is also required by compliance frameworks including PCI DSS, SOC 2, and ISO 27001.
SECFORCE
Leading UK offensive security consultancy based in Canary Wharf, delivering CREST-accredited penetration testing and adversary simulation to organisations with the most demanding security requirements.
NCC Group
Global cybersecurity consultancy with CREST, CHECK, and CBEST accreditation, renowned for deep technical research and comprehensive penetration testing services.
Nettitude
CREST, CHECK, and CBEST accredited UK consultancy within Lloyd's Register, delivering premium penetration testing for government and critical infrastructure.
NetSPI
Leading penetration testing firm with the Resolve platform for continuous attack surface management, trusted by nine of the top ten US banks.
Pen Test Partners
The UK's largest independent security testing firm, renowned for IoT/OT research, CBEST red teaming, and CHECK/CREST-accredited penetration testing across all sectors.
PwC Cyber Security
Global Big Four professional services firm delivering CREST, CHECK, and CBEST-accredited penetration testing and red teaming services from London, serving the UK's largest enterprises and regulated organisations.
Dionach
Global enterprise cybersecurity consultancy founded in 1999 in Oxford, holding rare CREST STAR-FS accreditation and delivering penetration testing, red and purple teaming, and PCI QSA services across five international offices.
MDSec
Elite UK offensive security consultancy specialising in CBEST/STAR/TIBER red teaming, advanced adversary simulation, and CREST-accredited penetration testing for FTSE 100 clients.
Trustwave
Global managed security provider with the elite SpiderLabs penetration testing team and deep PCI DSS compliance expertise.
Secarma
Manchester-based independent cybersecurity consultancy with over 20 years of experience delivering CREST and CHECK-accredited penetration testing, red teaming, and compliance certification services.
Cyberis
CREST and CHECK-accredited UK penetration testing consultancy with CBEST approval, specialising in infrastructure, application, and simulated attack assessments across the public and private sectors.
Aristi
CHECK and CREST-accredited Birmingham-based cyber security consultancy with over 15 years of experience delivering penetration testing, red teaming, and OT security assessments for government and private sector clients.
Web Application Penetration Testing FAQs
How long does a web application pen test take?+
A typical web application penetration test takes 5-15 days depending on the complexity of the application, number of user roles, and depth of testing required. Large enterprise applications with multiple modules may require longer engagements.
How often should web applications be pen tested?+
Web applications should be pen tested at least annually, and ideally after every major release or significant code change. Compliance frameworks like PCI DSS require annual testing at minimum.
What is the difference between automated scanning and manual pen testing?+
Automated scanners find common vulnerabilities quickly but miss business logic flaws and complex attack chains. Manual penetration testing combines automated tools with expert analysis to find deeper vulnerabilities that scanners cannot detect.