IT Operations & Cybersecurity Encyclopedia
SharePoint and OneDrive sharing audit evidence guide
SharePoint and OneDrive sharing audits require more than a list of sites. Auditors need evidence showing external users, anonymous links, guest access, site owners, sharing settings, file activity, sensitivity labels, DLP coverage, remediation tickets, and owner approval. This guide explains how to prepare a practical evidence package.
SharePointOneDriveExternal sharingPurview auditAudit evidence
Why it matters
Prepare defensible Microsoft 365 sharing evidence
SharePoint and OneDrive sharing can expose business documents, contracts, HR files, financial data, healthcare records, customer information, and project material. Audit preparation should prove what sharing is allowed, what exists today, who approved it, and what remediation is underway.
A useful evidence package combines tenant settings, site sharing settings, sharing reports, external user inventory, anonymous links, sensitivity labels, DLP policies, Purview audit logs, owner review, and remediation tickets.
This guide helps IT and security teams prepare sharing evidence. It does not replace legal review, privacy counsel, eDiscovery guidance, Microsoft support, or a professional Microsoft 365 security audit.
Practical rule: Every externally shared site, file, folder, and link should have an owner, business purpose, sharing method, risk rating, and review evidence.
Review scope
Sharing audit evidence domains
Tenant policy
Review global SharePoint and OneDrive sharing settings, link defaults, anonymous link restrictions, domain controls, and expiration.
Site and drive scope
Inventory sites and OneDrive accounts with external sharing, sensitive content, departed users, or broad access.
Link evidence
Collect anyone links, organization links, specific people links, direct permissions, expiration, and permission level.
Audit logs
Use Purview audit logs to support sharing events, permission changes, file access, downloads, and guest invitations.
Owner review
Require site or business owners to approve continued sharing and confirm business purpose.
Remediation
Track link removal, guest cleanup, permission tightening, policy changes, and exception approvals.
Review matrix
SharePoint and OneDrive sharing audit matrix
| Area | What to verify | Questions to answer | Evidence |
|---|---|---|---|
| Tenant settings | External sharing level, default link type, anonymous links, domain controls, expiration, and guest restrictions. | What sharing does the tenant allow? | Admin center screenshots, policy export, sharing settings report, and approval record. |
| Site inventory | Site URL, owner, sensitivity, external sharing state, guests, labels, activity, and business purpose. | Which sites create sharing risk? | Site export, owner map, sensitivity label report, guest report, and review worksheet. |
| Link report | Anyone links, specific people links, organization links, direct permissions, external users, and expiration. | What access exists today? | Sharing report, link export, permission sample, owner review, and removed-link ticket. |
| Audit activity | Sharing events, link creation, permission changes, guest invitations, file access, downloads, and deletions. | Can sharing activity be investigated? | Purview audit search, event sample, incident timeline, and retention note. |
| Data protection | Sensitivity labels, DLP, retention, eDiscovery, restricted sites, and sensitive data discovery. | Is sensitive data protected? | Label report, DLP policy, retention policy, discovery finding, and exception register. |
| Remediation | Owner signoff, removed links, guest cleanup, permission changes, policy changes, and validation. | Did audit findings reduce risk? | Remediation tracker, ticket evidence, before-and-after export, and owner approval. |
Step-by-step review
SharePoint and OneDrive sharing audit runbook
1
Export tenant sharing settings
Capture SharePoint and OneDrive external sharing levels, default link settings, anonymous link policy, expiration, and domain controls.
2
Inventory high-risk sites and drives
List externally shared sites, sensitive sites, executive or HR sites, departed-user drives, and OneDrive accounts with broad sharing.
3
Collect sharing reports
Export links, external users, anyone links, specific people links, permissions, expiration, and affected files or folders.
4
Search Purview audit logs
Collect evidence for link creation, sharing invitations, permission changes, file access, downloads, and suspicious sharing activity.
5
Validate sensitive data exposure
Review labels, DLP matches, sensitive data findings, retention requirements, and whether high-risk content is externally accessible.
6
Get owner signoff
Ask site and business owners to approve, remove, or modify sharing based on business need and sensitivity.
7
Close remediation with evidence
Retain before-and-after exports, tickets, policy changes, owner approvals, exception decisions, and validation screenshots.
Common risks
Common sharing audit evidence gaps
Tenant settings are not captured
Auditors need to know what sharing policy allowed at the time evidence was collected.
Anonymous links are missed
Anyone links are often the highest-risk sharing method and should be reviewed carefully.
Owners are not involved
IT exports are not enough; business owners must confirm whether sharing is still justified.
Audit logs are not retained
Sharing events and permission changes may be unavailable if audit retention is not planned.
Sensitive content is not prioritized
External sharing risk should be weighted by data sensitivity and business impact.
Remediation is not validated
Removed links and permission changes should be confirmed with a fresh export.
Related support
Where IT Perfection can help
IT Perfection can help collect SharePoint and OneDrive sharing reports, review Microsoft 365 sharing settings, clean up guest access, and prepare owner review evidence.
OC Security Audit can help assess Microsoft 365 sharing exposure, audit evidence, data leakage risk, cyber insurance readiness, and remediation priorities.
Related professional support
Created by Ali Hassani, CISO
Professional SharePoint and OneDrive sharing audit support
Ali Hassani brings 25+ years of hands-on experience across IT operations, cybersecurity, Microsoft infrastructure, network security, compliance readiness, cloud services, healthcare IT, MSP services, and business technology leadership.
This guide is for initial education and planning. It does not replace a professional cybersecurity audit, compliance assessment, penetration test, legal review, vendor engineering review, or Microsoft professional services engagement.
Sharing evidence should be complete and owner-approved
A strong sharing audit package connects tenant policy, site scope, links, external users, audit logs, data sensitivity, remediation, and owner signoff.
FAQ
SharePoint and OneDrive sharing audit FAQ
What evidence should be collected first?
Start with tenant sharing settings, site inventory, sharing reports, external users, anonymous links, and Purview audit activity.
Why is owner signoff important?
Business owners can confirm whether shared files, folders, sites, and guests still have a valid business purpose.
Should OneDrive be included?
Yes. OneDrive can contain sensitive user-created files, departed-user data, anonymous links, and externally shared content.
What proves remediation?
Use before-and-after exports, removed-link evidence, guest cleanup tickets, policy changes, owner approval, and validation reports.
