Subsite-Specific SharePoint Graph API Access

Problem Context

Teams using SharePoint for legacy data workflows (like SSIS automation) relied on ACS (App Credential Service) to access specific subsites. With ACS retirement, their automations broke because Microsoft’s Graph API only grants permissions at the site-collection level, not subsites. Security policies block granting full site access, leaving them stuck.

Pain Points

They tried switching to Registered Apps with Graph’s Sites.Selected, but it fails to scope to subsites—only works at the root level. Their 3rd-party auth provider blocks app passwords, and security teams refuse to grant over-permissive access. Manual workarounds (like recreating automations) are time-consuming and error-prone.

Impact

Broken automations mean delayed data processing, failed reports, and manual fixes that waste 10+ hours/week. For data teams, this directly impacts revenue-generating workflows (e.g., financial reporting, inventory updates). The longer it’s unresolved, the higher the risk of compliance violations or lost business opportunities.

Urgency

This is a forced migration with no good alternatives. Microsoft’s native tools don’t solve subsite-scoped access, and security policies make workarounds impossible. Teams need a solution now to restore broken workflows before deadlines are missed or data accuracy suffers.

Target Audience

SharePoint administrators, data engineers, and IT teams in enterprises with legacy SharePoint sites (especially those using SSIS, Power Automate, or custom automations). Also affects consulting firms helping clients migrate off ACS, as they lack a scalable solution for subsite access.

Solution Approach

A micro-SaaS that acts as a permission-scoping proxy for the Graph API. Users input their subsite URL and app ID, and the tool dynamically grants the app *only- the permissions needed for that subsite—no over-provisioning. It handles OAuth flows for 3rd-party auth providers and monitors permissions to prevent drift.

Key Features

1. 3rd-Party Auth Support: Works with any OAuth provider (e.g., Azure AD, Okta) without requiring app passwords.
2. Permission Monitoring: Continuously checks if the app’s permissions align with the subsite’s security policies, alerting users to drift.
3. Audit Logs: Tracks all API calls and permission changes for compliance.

User Experience

Users paste their subsite URL and app ID into the tool. It generates a scoped access token in seconds, which they plug into their automation (e.g., SSIS). The tool runs in the background, ensuring permissions stay subsite-limited. Alerts notify them if something changes—no manual checks needed.

Differentiation

Unlike Microsoft’s native tools, this solves the subsite-scoping problem without requiring site-collection-level permissions. It’s cheaper than hiring consultants to manually reconfigure automations and more reliable than duct-tape workarounds. The permission-monitoring feature prevents security gaps that could lead to breaches.

Scalability

Starts with single-subsite support, then adds multi-subsite dashboards, team collaboration features, and integrations with monitoring tools (e.g., Datadog). Pricing scales with the number of subsites/apps managed, and enterprises can white-label it for internal teams.

Expected Impact

Restores broken automations in minutes, eliminating manual fixes and downtime. Reduces security risks by ensuring least-privilege access. Saves 10+ hours/week per team on permission management and troubleshooting. For enterprises, it’s a critical tool to avoid revenue loss from failed data workflows.