CREST-Certified GCP Cloud Security Review for UK Businesses
A GCP security posture review is a CREST-certified assessment of a Google Cloud organisation against the CIS Google Cloud Platform Foundations Benchmark. Manual exploitation across IAM, Cloud Storage, GKE, Cloud Functions, Cloud Run, Cloud SQL, Secret Manager, and VPC. Multi-project organisations supported. Live findings during testing, free retests after remediation, fixed-price scope within 24 hours.
- Unlimited retesting
- Unlimited pre-retesting
- No hidden fees
“I would highly recommend EJN Labs to any organisation seeking reliable, detailed, and well-managed penetration testing services, particularly for government or enterprise-level projects.”
Imran SaghirProject Lead, SquareOne“There wasn’t another company we could find that could deliver what we needed in the timeframe we needed. The client loved it, and we got instant ROI from the engagement.”
Dan WilcocksonCo-Founder, Celloriof GCP IAM bindings inherit broader access than required. Service-account impersonation is the #1 GCP privilege-escalation path.
GCP scanners flag misconfigurations. We exploit them.
Security Command Center flags overly permissive Cloud Storage buckets and excessive IAM roles. It cannot tell you whether your Cloud Function’s service account can impersonate every other service account in your project, whether your GKE pod can hijack the workload identity, or whether your Cloud Run service has standing access to production secrets.
Our GCP cloud security review combines automated CIS Google Cloud Platform Foundations scanning with manual exploitation across IAM, GKE, Cloud Functions, and the Resource Manager control plane. Reports satisfy ISO 27001 Annex A.13.1, SOC 2 CC6.6, PCI DSS Req 11.3, and align with NCSC cloud security principles.
Our GCP reviews are delivered by a CREST-accredited UK team for public-sector tenants. ISO 27001, SOC 2, PCI DSS, and NCSC cloud audits accept manual review evidence. Scan-only evidence is generally insufficient.
12 GCP SERVICES AUDITED
What a GCP Security Posture Review Covers
Aligned to the CIS GCP Foundations Benchmark v3.0; multi-project environments supported.
IAM & Service-Account Impersonation
Service-account impersonation chains, IAM Conditions audit, role recommender review, custom role analysis, group-based access boundary.
Cloud Storage
Public bucket audit, IAM vs ACL precedence, signed URL leakage, Object Versioning policy, Bucket Lock review.
GKE & Workload Identity
Workload Identity boundary, RBAC, Network Policies, GKE Autopilot vs Standard, Binary Authorization, image security.
Cloud Functions
Function service account scope, runtime environment leakage, IAM allow-internal, source code privacy, Pub/Sub trigger auth.
Cloud Run
Service-account binding, ingress restriction, VPC connector, custom domain TLS, traffic split security.
Cloud SQL
Public IP exposure, encryption at rest, automatic backups, IAM database authentication, snapshot privacy.
Secret Manager
Access policy review, rotation enforcement, replication policy, version history retention, Cloud Build secret leakage.
VPC Service Controls
Default network audit, firewall rule review, Shared VPC, VPC Service Controls, Private Service Connect, BGP routing.
Cloud KMS
Key ring access, automatic rotation, version state management, key policy review, Cloud HSM scope.
Cloud Logging
Cloud Audit Logs coverage, sink configuration, log integrity, retention policies, BigQuery export security.
Cloud Build (SLSA)
Build trigger security, service account scope, Artifact Registry security, supply chain integrity (SLSA).
Resource Manager
Organization policy enforcement, project IAM inheritance, billing account boundaries, folder structure scrutiny.
FOUR-PHASE METHODOLOGY
GCP Cloud Security Review: From Project Inventory to Hardening Plan
Read-only by default. Manual exploitation only with explicit written approval per resource type.
Project Discovery
Resource Manager mapping, GCP project inventory, Terraform/Deployment Manager review, IAM binding extraction. Read-only via predefined Viewer / SecurityReviewer roles.
CIS Benchmark Audit
CIS Google Cloud Platform Foundations v3.0 control-by-control assessment. Security Command Center recommendations review. Compliance baseline established.
Manual Exploitation
IAM service-account impersonation chains, Cloud Storage enumeration, Cloud Function abuse, GKE pod escape, Secret Manager access policy abuse, all with written authorisation.
Report & Hardening
CIS-mapped findings, prioritised remediation plan, Terraform / Deployment Manager patch examples, executive + technical reports. Free retest within 30 days.
CREDENTIALS
Verified Accreditations Auditors Accept
Every credential below is independently verifiable. UK procurement teams, FCA supervisors, ISO 27001 / SOC 2 auditors, and cyber insurance underwriters all recognise these standards.
GET YOUR QUOTE
Get a fixed GCP Cloud Security Review quote in 24 hours
A fixed-price quote back in one business day, from a named CREST assessor. No sales pipeline, no chasing.
- CREST and IASME accredited. Testing your auditors and clients already recognise.
- Fast-track testing within 24 hours where required. Free retest of every fix included.
- Live findings via your client portal, not a four-week PDF.
- Fixed price from £3,500 for a single-role, single-app scope, agreed up front. Most engagements run £5,000 and up. No day-rate surprises.
Dan WilcocksonCo-Founder, CelloriUnder NDA Further named references available on a scoping call.
- We reply within one business day with a fixed-price quote from a named CREST assessor.
- You approve the scope and we book a start date, usually within 24 hours.
- Live findings land in your client portal as we test, with a free retest of every fix.
Get your fixed GCP Cloud Security Review quote in 24 hours
Quote request received
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COMPLIANCE READY
GCP Reports Mapped to Every Framework
Findings tagged to CIS Benchmark control IDs and your specific compliance framework. Audit teams submit directly without translation.
CIS GCP Foundations Benchmark v3.0
Control-by-control compliance score and remediation evidence accepted by enterprise audit teams.
Google Cloud Architecture Framework
Security pillar review across identity, network, data protection, and detective controls in GCP tenants.
ISO 27001 (Annex A)
A.13 network security, A.14 secure development, A.18 compliance: GCP-control evidence ISO auditors accept.
SOC 2 Type I & II
CC6.6 logical access, CC7.1 vulnerability identification, CC7.2 monitoring evidence accepted by SOC 2 auditors.
PCI DSS
Req 1, 2, 7, 8, 11.3 control evidence for GCP-hosted PCI scope, including segmentation and encryption attestation.
NCSC Cloud Security Principles
14 principles assessed for cloud workloads in GCP tenants.
PRICING
Transparent GCP Cloud Security Review Pricing
All tiers include the same depth of testing. Price varies by GCP estate complexity: project count, service breadth, resource volume, and Organization scope.
Depends on GCP estate size
Single GCP project, ≤10 services in use, ≤50 resources, basic IAM. Typically 4-5 day engagement.
Get a fixed quoteDepends on GCP estate size
Cloud Resource Manager folder (3-10 projects), 10-20 services, GKE or Cloud Functions, CI/CD via Cloud Build. Typically 7-10 day engagement.
Get a fixed quoteDepends on GCP estate size
GCP Organization (10+ projects), 20+ services, multi-region, GKE Autopilot + VPC Service Controls + data perimeter. Typically 10-15 day engagement.
Get a fixed quoteBY SECTOR
GCP Cloud Security Review for Your Sector
GCP deployment patterns vary by sector. We test the controls your regulators specifically require.
Fintech
FCA-regulated firms, Open Banking, payment APIs, PCI scoping.
Fintech sector pageSaaS
Multi-tenant isolation, SSO/SAML/OIDC, customer-data perimeter, SOC 2 evidence.
SaaS sector pageLaw
Privileged-data confidentiality, partner-tier scrutiny, SRA Cyber Standard alignment.
Law firm sector pageHealthcare
NHS DSPT, NHS DTAC, EHR integration, telehealth, patient-data PII.
Healthcare sector pageInsurance
FCA / PRA Operational Resilience, claims data, broker integrations, cyber underwriting evidence.
Insurance sector pagePublic Sector
CCS / G-Cloud framework, NCSC-aligned, SC-cleared testers available.
Public sector pageWHY EJN LABS
What You Actually Get
What distinguishes our GCP cloud security review from automated scans and box-tick competitors.
What You Get From GCP Penetration Testing
Read-only audit across IAM, GKE, Cloud Storage, Cloud Functions, Secret Manager, and 7 more services, with manual exploitation chains and a CIS-mapped hardening plan.
CIS Benchmark + Manual Combination
Automated CIS scan establishes the baseline. Manual exploitation tests what scanners cannot: IAM impersonation chains, workload identity abuse, GKE pod escapes.
Read-Only by Default
We start with predefined Viewer and SecurityReviewer roles. No write access required. Manual exploitation only with explicit written approval per resource.
Terraform / Deployment Manager Patches
Every finding ships with example IaC remediation: Terraform module diffs, Deployment Manager patches. Engineers fix faster.
Free Retests Within 30 Days
Verify remediation of every GCP finding before close-out. Letter of attestation for audit submission included as standard, no per-retest charge.
UK CREST Accredited
Independently CREST-accredited. Public-sector-ready evidence for tenants and government suppliers. Reports accepted by FCA, NCSC, NHS, ICO, SOC 2 auditors, and cyber insurers.
FAQ
Frequently Asked
How long does a GCP cloud security review take?
Single-project (≤10 services, ≤50 resources) typically takes 4-5 working days. Folder-level multi-project takes 7-10 days. Organization-level enterprise (10+ projects, multi-region GKE) takes 10-15 days.
How much does GCP penetration testing cost in the UK?
Single-project £4,500-£8,000. Multi-project £8,000-£14,000. Organization-level £14,000-£22,000. All quotes are fixed-price after scoping. Day rate for CREST-certified testers is £1,100–£1,400 per day.
Do you follow the CIS GCP Foundations Benchmark?
Yes. Every GCP engagement includes a control-by-control CIS Google Cloud Platform Foundations v3.0 assessment, plus Security Command Center recommendation review.
Do you test service-account impersonation paths?
Yes. Service-account impersonation is the #1 GCP privilege-escalation path. We map the full impersonation graph using IAM Recommender data plus manual analysis, and identify chains that lead to high-value resources.
Do you test GKE / Kubernetes pod security?
Yes. GKE reviews include Workload Identity boundary scrutiny, RBAC, Network Policies (Calico / Cilium), Binary Authorization (image signing), GKE Autopilot vs Standard differences, and pod-to-node escape paths.
What about multi-project GCP Organizations?
Multi-project testing is fully supported. We map the entire Cloud Resource Manager hierarchy (Organization → Folders → Projects), audit Organization Policies, and test VPC Service Controls boundary enforcement.
What is a GCP configuration review?
A GCP configuration review checks every project in your Google Cloud organisation against the CIS Google Cloud Platform Foundations Benchmark, covering IAM, service accounts, storage, networking and GKE. It is the configuration-audit half of a GCP security posture review, paired with manual exploitation to confirm which misconfigurations are actually reachable.
Is a GCP security posture review the same as a GCP cloud security review?
Yes. GCP security posture review, GCP configuration review and GCP cloud security review all describe the same engagement: a CREST-certified assessment of your Google Cloud organisation against the CIS Foundations Benchmark, combined with manual exploitation across IAM, storage, GKE and networking. The name varies by buyer; the methodology does not.
Do you test VPC Service Controls?
Yes. VPC Service Controls are the modern GCP data perimeter. We test access level enforcement, ingress / egress rule effectiveness, and identify common bypass patterns (e.g. allowed Google APIs, dry-run mode).
Do you test Cloud Build supply chain?
Yes. Cloud Build supply chain (SLSA framework alignment) is part of cloud reviews. We audit build triggers, service account scope, Artifact Registry permissions, container image signing (Binary Authorization), and OIDC trust into other clouds.
Is testing read-only or do you make changes?
Read-only by default. We use predefined Viewer and SecurityReviewer roles. Manual exploitation phases only run with explicit written authorisation per resource type, in agreed maintenance windows.
Do you provide remediation guidance?
Yes. Every finding ships with prioritised remediation guidance and example Terraform / Deployment Manager / gcloud CLI commands. For high-severity findings we include direct engineer access via our portal during remediation.
Are your testers UK-based and what certifications do they hold?
All GCP testers are vetted UK or international engineers. Relevant certifications: CREST CRT and CCT INF, Google Professional Cloud Security Engineer, OSCP. SC-cleared testers available for public-sector engagements.
Do you sign NDAs?
Yes. Standard NDA before any technical detail is shared. We operate under a project-specific master agreement that includes data handling, deliverable IP, and breach notification clauses.
What is a cloud security posture assessment?
A cloud security posture assessment reviews a cloud environment against a recognised benchmark to find misconfigurations and weak controls. For Google Cloud we use the CIS GCP Foundations Benchmark, then go further than an automated tool by manually exploiting the findings to show real, prioritised risk rather than a raw list.
What is the difference between CSPM and a GCP security posture review?
CSPM, or cloud security posture management, is automated tooling that continuously flags misconfigurations. A GCP security posture review is a point-in-time, CREST-certified human assessment that benchmarks the same controls and then proves which weaknesses an attacker could exploit, with a hardening plan your auditors will accept.
20+ CREST-certified testing services in one place
Web, mobile, API, cloud, AI, infrastructure, red team. Pick the test that fits your environment.
Book a GCP Security Review Scoping Call
A CREST-certified GCP security specialist will contact you within one business day with a fixed price, a realistic timeline, and the named consultant. No sales pipeline.
