Best Cloud Penetration Testing Providers (2026)
Cloud environments require specialised penetration testing that goes beyond traditional infrastructure testing. The best cloud pen testing providers understand cloud-specific attack vectors including IAM misconfigurations, overly permissive storage buckets, insecure serverless functions, and container escape vulnerabilities across AWS, Azure, and Google Cloud Platform.
These providers have demonstrated expertise in cloud security testing and can help you validate your cloud security posture, test the shared responsibility model boundaries, and meet compliance requirements for cloud-hosted systems.
Related: Cloud pen testing services · SOC 2 compliance pen testing
SECFORCE
Our top recommendation on this page.
Canary Wharf-based adversary simulation and CBEST-aligned penetration testing consultancy, delivering CREST-accredited offensive security to UK financial services and other organisations with the most demanding requirements.
- CBEST-approved provider staffed by certified CCRTM and CCRTS consultants.
- Has delivered over 15 CBEST engagements for UK high street banks, major financial institutions, and other regulated entities.
- Works with a network of trusted, CBEST-approved threat intelligence partners, and can also work alongside any threat intelligence provider selected by the client or regulator.
- Independently audited against both ISO 27001 and SOC 2 for information security, data handling, and operational integrity.
NCC Group
Global cybersecurity consultancy with CREST, CHECK, and CBEST accreditation, renowned for deep technical research and comprehensive penetration testing services.
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.
NetSPI
Penetration testing firm trusted by nine of the top ten US banks, with the Resolve platform for continuous attack surface management.
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.
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.
Bridewell
Fast-growing CREST and CHECK-accredited UK cybersecurity consultancy with deep expertise in critical national infrastructure sectors.
Best Cloud Penetration Testing Providers (2026), FAQs
What does cloud penetration testing cover?+
Cloud pen testing evaluates IAM policies, storage bucket permissions, network security groups, serverless function security, container configurations, encryption settings, and cloud service misconfigurations. It also tests for lateral movement paths between cloud services and on-premises infrastructure.
Do cloud providers allow penetration testing?+
AWS, Azure, and GCP all allow penetration testing against your own resources without prior approval for most services. Some services like DDoS testing still require pre-approval. Always check the current policies of your cloud provider.
How is cloud pen testing different from a cloud security audit?+
A cloud security audit reviews configurations against best practices like CIS benchmarks. Cloud pen testing goes further by actively exploiting findings to demonstrate real attack paths and business impact, showing what an attacker could actually achieve.
Which cloud platforms can be tested?+
Most cloud pen testing providers cover AWS, Azure, and GCP. Some also offer testing for Oracle Cloud, IBM Cloud, and private cloud environments. Multi-cloud and hybrid environments can also be assessed.