How to get ISO 27018 certified for cloud providers

Audit documents and compliance review materials Photo: Unsplash

If you are researching how to get ISO 27018 certified, begin by clarifying the assurance route. ISO 27018 is a code of practice and is commonly assessed with an ISO 27001 information security management system rather than certified as a standalone management system.

This guide covers:

ISO 27001 prerequisites and accurate certification claims
Scope, gap analysis, implementation, and evidence
Internal and external audit stages
Continuous operation after the assessment

Related guides:

Moving from gap analysis to audit

GIF via GIPHY

Key takeaways

Confirm the certification model before starting. Ask the certification body how ISO 27018 will be assessed and referenced.
ISO 27001 is commonly the foundation. Its ISMS supplies governance, risk treatment, audit, management review, and continual improvement.
Scope must match your PII processor role. Identify services, entities, locations, subprocessors, and customer data flows.
Operating evidence determines readiness. Agreements and policies need supporting access, supplier, incident, rights, retention, and deletion records.
Certification is not the finish line. Surveillance, changes, corrective actions, and recurring controls require continuing ownership.

What ISO 27018 certification means

Organizations often use “ISO 27018 certified” as shorthand, but the issued assurance may be an ISO 27001 certificate whose scope or supporting documentation references ISO 27018. Practices vary by certification body and accreditation arrangement.

Before budgeting or marketing:

Select an accredited certification body appropriate to your market.
Ask whether ISO 27018 can be included in the ISO 27001 audit criteria.
Request an example of certificate and scope wording.
Confirm required ISO 27001 status and transition timing.
Verify which service, legal entities, and locations will be named.
Approve external claims only after documents are issued.

This protects buyers and your organization from an ambiguous or unsupported statement.

1. Confirm prerequisites and scope

If you do not have an ISO 27001 ISMS, build the management-system foundation: context, scope, leadership, risk methodology, risk treatment, Statement of Applicability (SoA), objectives, competence, document control, internal audit, management review, and corrective action.

Define the ISO 27018 scope around public cloud PII processing:

Cloud services and product editions
Legal entities, teams, and support locations
PII categories, data subjects, and processing purposes
Production, backup, logging, analytics, and support systems
Data locations and transfers
Infrastructure providers and subprocessors
Customer instructions and processing agreements

Scope choice	Risk if unclear	Evidence
Provider role	Wrong controls or claims	Role assessment
Service boundary	Missing systems	Architecture and inventory
Locations	Incomplete transparency	Configuration and supplier records
Subprocessors	Unmanaged processing	Register and agreements
Exclusions	Buyer misunderstanding	Documented rationale

Have privacy, legal, security, engineering, product, and leadership approve the boundary.

2. Run a gap analysis

Map ISO 27018 guidance to existing ISO 27001/27002 controls and privacy procedures. Evaluate each item for applicability, design, operation, evidence, and ownership.

Common gaps include:

Processing purposes not linked to product features
Agreements that differ from actual retention or deletion behavior
Incomplete subprocessor locations or change notices
Privileged support access without periodic review
Incident plans without privacy notice decisions
Rights-support procedures that have never been tested
Backup deletion language unsupported by architecture
Customer instructions stored across disconnected systems

Prioritize remediation by PII sensitivity, number of customers, legal and contractual exposure, technical risk, and audit lead time. Assign owners and realistic deadlines; preserve rationale for accepted risks.

3. Implement cloud PII controls

Build or update workflows for:

Instructions and purpose limitation

Define approved processing purposes, intake for customer instructions, product-change review, and escalation for conflicting requests. Train product, support, and engineering teams on the boundary.

Transparency and suppliers

Maintain accurate service descriptions, locations, subprocessors, processing activities, and security features. Conduct supplier diligence, execute appropriate terms, monitor changes, and issue notices according to commitments.

Access, encryption, and operations

Apply least privilege, MFA, named administration, access reviews, encryption requirements, key controls, secure configurations, vulnerability management, logging, and incident detection to PII systems. Document exceptions.

Requests, incidents, return, and deletion

Define customer-authorized workflows, handoffs, target times, evidence, and escalation. Map deletion across active data, replicas, logs, derived stores, and backups. Account for legal holds and documented backup expiry.

Do not isolate these as “privacy paperwork.” Embed gates in product planning, supplier onboarding, deployment, support, and offboarding.

4. Operate and test evidence

Allow enough operating time to demonstrate that controls work. The appropriate period depends on the audit plan and control frequency; confirm expectations with your certification body.

Build an index linking each control to owner, frequency, source, reviewer, audit period, and retention. Typical evidence includes:

ISMS scope, risk register, treatment plan, and SoA
PII inventory, data flows, role decisions, and retention schedule
Processing agreements and instruction records
Subprocessor diligence, contracts, reviews, and notices
Access exports, approvals, review results, and removals
Encryption and configuration records
Incident exercises, decision logs, and corrective actions
Rights-support and deletion samples
Training, internal audit, and management review records

Test traceability. An assessor should be able to move from a customer promise to a control, system setting, operating record, exception, and closure.

5. Complete the audit

Internal audit and management review

Conduct an internal audit sufficiently independent from control operation. Sample across services, systems, time periods, and subprocessors. Resolve or formally treat findings. Management should review audit results, privacy incidents, metrics, customer issues, risks, changes, resources, and improvement actions.

External assessment

The certification body commonly plans scope and sampling, reviews documented management-system design, and tests implementation and operating effectiveness. Be ready for interviews with privacy, engineering, security, legal, procurement, support, and leadership.

Audit phase	Team objective	Typical output
Planning	Confirm criteria, scope, sites, timing	Audit plan
Documentation review	Show designed system	Readiness findings
Implementation audit	Demonstrate operation	Findings and report
Corrective action	Address nonconformities	Accepted closure evidence
Certification decision	Independent review	Certificate/supporting documents

Do not hide issues. Present controlled exceptions and corrective action honestly; an operating improvement process is part of management-system maturity.

Plan the audit workspace before fieldwork. Give assessors a clear index, use consistent artifact names, identify confidential evidence, and assign one coordinator for requests. Control owners should answer how the workflow operates and demonstrate source systems; they should not memorize scripted responses. Track every request, owner, delivery, clarification, and resulting finding so nothing is lost across interviews.

If a nonconformity is raised, confirm the requirement and evidence behind it, determine root cause, correct the immediate issue, and implement a systemic action. A missing access review may require completing the review, but the durable fix could be an automated population report, backup owner, escalation rule, and effectiveness check.

6. Maintain assurance

After issuance, continue recurring access reviews, supplier assessments, evidence collection, deletion testing, internal audits, management reviews, and corrective actions. Trigger reassessment when products add new PII uses, regions, integrations, or subprocessors.

Track useful metrics: overdue privacy actions, access-review completion, deletion success, incident notification decisions, supplier review status, training, and time to close audit findings. Avoid vanity metrics that do not indicate control health.

Review public claims after scope or certificate changes and prepare for surveillance and recertification activities specified by the certification body.

Prepare with SecureSlate

SecureSlate helps cloud providers map ISO 27018 to their ISMS, assign owners, automate evidence, manage gaps, centralize supplier and privacy records, and stay prepared between audits.

Get started for free: Create your SecureSlate account

FAQ: ISO 27018 certification

Is ISO 27001 required first?

ISO 27001 is commonly the certifiable management-system foundation. Confirm the exact route and sequencing with your chosen certification body.

How long does the process take?

It depends on scope, ISMS maturity, PII complexity, remediation, and required operating evidence. Plan from the gap analysis rather than relying on a generic estimate.

Can a SaaS provider claim standalone ISO 27018 certification?

Use only wording supported by issued, valid assessment documents. Ask the certification body and counsel to review proposed claims.

What causes audit delays?

Unclear scope, stale inventories, inconsistent contracts, missing operating periods, weak deletion evidence, and overdue internal findings commonly create friction.

Does certification prove legal compliance?

No. Certification offers assurance against stated audit criteria; it does not replace legal analysis or guarantee compliance with every law or contract.

Disclaimer (legal note)

SecureSlate is not a law firm, and this article does not constitute legal advice or create an attorney-client relationship. Certification practices may vary. Consult qualified counsel, privacy professionals, official standards, and an accredited certification body.