Penetration testing firm trusted by nine of the top ten US banks, with the Resolve platform for continuous attack surface management.
Accreditations: SOC 2, ISO 27001, CREST
Services: Web Application, Network, Cloud, API +7
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.
About this list
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
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SECFORCE
UK offensive security consultancy delivering CREST-accredited penetration testing, adversary simulation and CBEST, TIBER-EU and TBEST threat-led testing, mainly for financial services and other large organisations.
CRESTCBESTSTARISO 27001ISO 9001
- Holds CREST, CBEST, STAR, ISO 27001, ISO 9001, and Cyber Essentials accreditations.
- In business since 2008 (Companies House 06488355); CREST-accredited for penetration testing since 2011.
- CBEST-accredited since 2015; first TIBER engagement in 2018.
- CREST accreditations: penetration testing, vulnerability assessment and threat-led penetration testing (formerly STAR).
84 providers
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.
Accreditations: CREST, CHECK, STAR, ISO 27001, PCI QSA +1
Services: Web Application, Network, Red Teaming, Purple Teaming +7
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.
Accreditations: CREST, CHECK, CBEST, STAR, ISO 27001 +1
Services: Web Application, Network, IoT, Cloud +9
US penetration testing firm founded in 2011, running 600+ engagements a year with a fully remote, US-based team. Manual, expert-led testing across web, network, cloud, mobile, wireless, OT/ICS, and AI/LLM. Gartner Sample Vendor for PTaaS.
Accreditations: OSCP Employer
Services: Web Application, Network, Mobile App, Cloud +12
CREST and CHECK-accredited UK penetration testing and managed security provider formed in 2026 from Pentest People, Bulletproof, and Target Defense, with CREST STAR/TLPT-FS capability and the GuardNest vulnerability management platform.
Accreditations: CREST, CHECK, STAR, NCSC Assured, ISO 27001 +1
Services: Web Application, Network, Mobile App, API +8
Elite UK offensive security consultancy specialising in CBEST/STAR/TIBER red teaming, advanced adversary simulation, and CREST-accredited penetration testing for FTSE 100 clients.
Accreditations: CREST, CHECK, CBEST, STAR, ISO 27001 +2
Services: Web Application, Network, Cloud, Red Teaming +6
Full-service London-based cybersecurity consultancy with CREST, CHECK, and NCSC accreditations delivering offensive testing, managed detection, and strategic advisory services.
Accreditations: CREST, CREST AI Penetration Testing, CHECK, ISO 27001, Cyber Essentials +2
Services: Web Application, Network, Cloud, API +5
Global managed security provider with the elite SpiderLabs penetration testing team and deep PCI DSS compliance expertise.
Accreditations: PCI QSA, ISO 27001, SOC 2, CREST
Services: Web Application, Network, Mobile App, Cloud +6
Manchester-based independent cybersecurity consultancy with over 20 years of experience delivering CREST and CHECK-accredited penetration testing, red teaming, and compliance certification services.
Accreditations: CREST, CHECK, ISO 27001, Cyber Essentials, Cyber Essentials Plus +1
Services: Web Application, Network, Mobile App, Cloud +5
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.
Accreditations: CREST, CHECK, CBEST, STAR, ISO 27001 +3
Services: Web Application, Network, Mobile App, Cloud +4
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.
Accreditations: CREST, CHECK, ISO 27001, Cyber Essentials, Cyber Essentials Plus +1
Services: Web Application, Network, Mobile App, Cloud +7
Fast-growing CREST and CHECK-accredited UK cybersecurity consultancy with deep expertise in critical national infrastructure sectors.
Accreditations: CREST, CHECK, ISO 27001, Cyber Essentials Plus
Services: Web Application, Network, Cloud, API +6
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.
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