SaaS Security Checklist

SaaS Security Checklist for Product Teams

A practical checklist for reviewing SaaS application security across authentication, tenant isolation, access control, API behavior, user workflows, integrations, billing logic, and sensitive data exposure.

Request SaaS Security Review View Sample Reports

Checklist

SaaS Security Review Areas

SaaS security extends far beyond authentication. Modern products rely on tenant isolation, authorization, APIs, integrations, billing workflows, and business logic all working together. Use this checklist to review the areas where real-world SaaS security failures most commonly occur before releasing new features or onboarding customers.

Authentication & Account Security

Protect signup, login, password reset, and recovery flows
Require strong authentication for admin and sensitive areas
Prevent account enumeration through response differences
Review MFA enrollment and recovery logic
Validate email change and account ownership workflows

Session & Token Management

Use Secure, HttpOnly, and SameSite cookie settings where applicable
Invalidate sessions after logout, password change, and account removal
Review token lifetime, refresh behavior, and scope
Prevent session reuse after role or tenant changes
Validate token state server-side on sensitive actions

Tenant Isolation

Confirm users cannot access another tenant’s data
Review workspace, organization, account, and team boundaries
Test tenant filters across dashboards, search, reports, and exports
Validate tenant context in background jobs and integrations
Confirm inactive or deleted tenant records are not accessible

Access Control & Roles

Document role and permission boundaries
Enforce permissions server-side for every sensitive action
Test Admin, Manager, Member, Viewer, Guest, and invited roles
Verify demotion, removal, and suspension behavior
Prevent client-controlled role or permission changes

Object Ownership & IDOR/BOLA

Validate ownership on every object-level request
Review files, reports, invoices, users, teams, comments, and billing records
Confirm authorization applies across GET, POST, PATCH, PUT, and DELETE
Test nested objects and related resources
Add regression coverage for ownership validation

API & GraphQL Exposure

Review REST and GraphQL endpoints for authorization gaps
Validate resolver-level access control and mutation permissions
Prevent overly broad API and nested GraphQL responses
Review rate limits, pagination, and query complexity controls
Confirm mobile, legacy, and internal APIs enforce the same rules

Invite & User Management

Test invite creation, acceptance, cancellation, and resend flows
Prevent invited users from selecting unauthorized roles or tenants
Review team membership and role assignment logic
Invalidate old invites and removed-user sessions
Validate user management actions server-side

Billing, Plans & Usage Limits

Validate plan limits and seat limits server-side
Review billing, upgrade, downgrade, and cancellation workflows
Prevent direct API calls from bypassing payment or entitlement checks
Confirm usage counters cannot be manipulated by client-controlled values
Protect invoices, payment metadata, and subscription state

Business Logic & Workflow Abuse

Review approval flows and state transitions
Prevent repeated use of one-time actions
Validate workflow order and required steps server-side
Test direct API calls against product-critical actions
Confirm business-rule failures deny state changes safely

Sensitive Data Exposure

Remove unnecessary fields from API responses
Protect emails, billing data, tokens, metadata, roles, and hidden fields
Review error messages for internal details
Confirm exports and reports only include authorized data
Validate access to deleted, archived, or inactive records

Integrations & Third-Party Connections

Review OAuth, API key, and connected-account flows
Protect integration tokens and webhook secrets
Validate tenant boundaries in sync jobs and webhooks
Confirm third-party actions require current authorization
Review connector permissions and data-sharing scope

File Uploads, Exports & Reports

Validate upload ownership and file access permissions
Restrict export endpoints by role, tenant, and object ownership
Review generated reports for cross-tenant data leakage
Protect attachments, invoices, and bulk downloads
Log sensitive export and report generation activity

Logging, Monitoring & Audit Trails

Log failed authorization and tenant-boundary checks
Alert on object-ID probing and repeated denied access
Capture audit trails for admin, billing, invite, and export actions
Monitor unusual workflow and integration activity
Document evidence for remediation and retesting

Security Headers & Browser Protections

Review Content Security Policy coverage
Confirm HSTS is enabled where appropriate
Use Secure, HttpOnly, and SameSite cookie protections
Add clickjacking protection for sensitive app areas
Validate CORS origins, methods, and credentials behavior

Release Readiness & Retesting

Review new features before release and customer onboarding
Retest fixes across related endpoints and roles
Verify alternate routes, mobile APIs, and legacy paths cannot bypass fixes
Document affected roles, objects, tenants, and workflows
Add regression tests for critical SaaS security paths

Review Flow

SaaS Security Review Flow

User Request→Authentication→Session Validation→Tenant Boundary→Role Permission→Object Ownership→Business Logic Validation→Data Returned / Action Allowed

Every sensitive SaaS action should pass authentication, session validation, tenant isolation, authorization, ownership validation, and business-rule enforcement before data is returned or state changes are accepted.

Common Mistakes