--- name: performing-oauth-scope-minimization-review description: 'Performs OAuth 2.0 scope minimization review to identify over-permissioned third-party application integrations, excessive API scopes, unused token grants, and risky OAuth consent patterns across identity providers and SaaS platforms. Activates for requests involving OAuth scope audit, API permission review, third-party app risk assessment, or consent grant minimization. ' domain: cybersecurity subdomain: identity-access-management tags: - OAuth - scope-minimization - API-security - consent-review - third-party-risk - token-audit version: '1.0' author: mahipal license: Apache-2.0 nist_csf: - PR.AA-01 - PR.AA-02 - PR.AA-05 - PR.AA-06 mitre_attack: - T1078 - T1110 - T1556 - T1098 mitre_f3: version: '1.1' tactics: - initial-access - positioning - stealth techniques: - id: T1550.001 name: 'Use Alternate Authentication Material: Application Access Token' tactic: initial-access source: attack - id: F1006.001 name: 'Account Takeover: Exposed API Key' tactic: initial-access source: f3 - id: F1004 name: Access with Stolen Session Cookie tactic: initial-access source: f3 - id: F1005.001 name: 'Account Manipulation: Account Linking' tactic: positioning source: f3 - id: T1539 name: Steal Web Session Cookie tactic: positioning source: attack - id: F1023 name: Device Fingerprint Spoofing tactic: stealth source: f3 --- # Performing OAuth Scope Minimization Review ## When to Use - Annual or quarterly review of third-party application OAuth permissions - After a security incident involving compromised OAuth tokens or unauthorized data access - Compliance audit requiring documentation of third-party data access (GDPR Article 28, SOC 2) - Discovery of shadow IT applications accessing organizational data via OAuth grants - Migration or consolidation of SaaS applications requiring permission cleanup - Implementing least-privilege principle for API integrations **Do not use** for reviewing first-party application permissions within the same trust boundary; OAuth scope minimization focuses on third-party and cross-boundary consent grants. ## Prerequisites - Admin access to identity providers (Microsoft Entra ID, Okta, Google Workspace) - Microsoft Graph API permissions: Application.Read.All, OAuth2PermissionGrant.ReadWrite.All - Inventory of approved third-party integrations from procurement or IT governance - OAuth scope risk classification framework - Tools for token analysis (jwt.io for manual review, automated scripts for bulk analysis) ## Workflow ### Step 1: Inventory All OAuth Grants and Consent Permissions Enumerate all OAuth application registrations and delegated permissions: ```python """ OAuth Grant Inventory - Microsoft Entra ID Enumerates all application registrations, service principals, and delegated/application permission grants. """ import requests import json from collections import defaultdict class EntraOAuthAuditor: def __init__(self, tenant_id, client_id, client_secret): self.tenant_id = tenant_id self.base_url = "https://graph.microsoft.com/v1.0" self.token = self._get_token(client_id, client_secret) self.headers = {"Authorization": f"Bearer {self.token}"} def _get_token(self, client_id, client_secret): url = f"https://login.microsoftonline.com/{self.tenant_id}/oauth2/v2.0/token" response = requests.post(url, data={ "grant_type": "client_credentials", "client_id": client_id, "client_secret": client_secret, "scope": "https://graph.microsoft.com/.default" }) return response.json()["access_token"] def get_all_service_principals(self): """Get all service principals (enterprise applications).""" apps = [] url = f"{self.base_url}/servicePrincipals?$top=999&$select=id,appId,displayName,appOwnerOrganizationId,servicePrincipalType,accountEnabled,createdDateTime" while url: response = requests.get(url, headers=self.headers) data = response.json() apps.extend(data.get("value", [])) url = data.get("@odata.nextLink") return apps def get_oauth2_permission_grants(self): """Get all delegated permission grants (user consent).""" grants = [] url = f"{self.base_url}/oauth2PermissionGrants?$top=999" while url: response = requests.get(url, headers=self.headers) data = response.json() grants.extend(data.get("value", [])) url = data.get("@odata.nextLink") return grants def get_app_role_assignments(self, sp_id): """Get application permission assignments for a service principal.""" url = f"{self.base_url}/servicePrincipals/{sp_id}/appRoleAssignments" response = requests.get(url, headers=self.headers) return response.json().get("value", []) def build_permission_inventory(self): """Build comprehensive OAuth permission inventory.""" service_principals = self.get_all_service_principals() delegated_grants = self.get_oauth2_permission_grants() # Map service principal IDs to names sp_map = {sp["id"]: sp for sp in service_principals} inventory = [] # Process delegated permissions for grant in delegated_grants: sp = sp_map.get(grant["clientId"], {}) scopes = grant.get("scope", "").split() for scope in scopes: if not scope: continue inventory.append({ "app_name": sp.get("displayName", "Unknown"), "app_id": grant.get("clientId"), "publisher_tenant": sp.get("appOwnerOrganizationId"), "is_third_party": sp.get("appOwnerOrganizationId") != self.tenant_id, "permission_type": "Delegated", "scope": scope, "consent_type": grant.get("consentType"), # AllPrincipals or Principal "principal_id": grant.get("principalId"), "granted_date": sp.get("createdDateTime"), "is_enabled": sp.get("accountEnabled", True) }) # Process application permissions for sp in service_principals: app_roles = self.get_app_role_assignments(sp["id"]) for role in app_roles: inventory.append({ "app_name": sp.get("displayName"), "app_id": sp.get("id"), "publisher_tenant": sp.get("appOwnerOrganizationId"), "is_third_party": sp.get("appOwnerOrganizationId") != self.tenant_id, "permission_type": "Application", "scope": role.get("appRoleId"), "consent_type": "AdminConsent", "granted_date": role.get("createdDateTime"), "is_enabled": sp.get("accountEnabled", True) }) return inventory ``` ### Step 2: Classify OAuth Scopes by Risk Level Categorize permissions based on data access sensitivity: ```python """ OAuth Scope Risk Classification Maps API scopes to risk levels based on data sensitivity and access breadth. """ MICROSOFT_GRAPH_SCOPE_RISK = { # CRITICAL - Full administrative or unrestricted access "critical": { "scopes": [ "Directory.ReadWrite.All", "RoleManagement.ReadWrite.Directory", "Application.ReadWrite.All", "AppRoleAssignment.ReadWrite.All", "Mail.ReadWrite", "Mail.Send", "Files.ReadWrite.All", "Sites.FullControl.All", "User.ReadWrite.All", "Group.ReadWrite.All", "MailboxSettings.ReadWrite", "full_access_as_app", ], "risk_description": "Can read/write all data, modify directory, or impersonate users", "review_frequency": "Monthly", "requires_admin_consent": True }, # HIGH - Broad read access or sensitive data write "high": { "scopes": [ "Mail.Read", "Mail.Read.Shared", "Calendars.ReadWrite", "Contacts.ReadWrite", "Files.Read.All", "Sites.Read.All", "User.Read.All", "Group.Read.All", "Directory.Read.All", "AuditLog.Read.All", "SecurityEvents.ReadWrite.All", "TeamSettings.ReadWrite.All", ], "risk_description": "Broad read access to sensitive organizational data", "review_frequency": "Quarterly", "requires_admin_consent": True }, # MEDIUM - Scoped data access "medium": { "scopes": [ "Calendars.Read", "Contacts.Read", "Files.ReadWrite", "Sites.ReadWrite.All", "Tasks.ReadWrite", "Notes.ReadWrite.All", "Chat.ReadWrite", "ChannelMessage.Send", "Team.ReadBasic.All", ], "risk_description": "Scoped access to specific data types with write capability", "review_frequency": "Semi-annually" }, # LOW - Minimal or user-profile only access "low": { "scopes": [ "User.Read", "openid", "profile", "email", "offline_access", "Calendars.Read.Shared", "People.Read", "User.ReadBasic.All", ], "risk_description": "Basic user profile or minimal scoped access", "review_frequency": "Annually" } } def classify_scope_risk(scope): """Classify a single OAuth scope by risk level.""" for risk_level, config in MICROSOFT_GRAPH_SCOPE_RISK.items(): if scope in config["scopes"]: return { "scope": scope, "risk_level": risk_level, "description": config["risk_description"], "review_frequency": config["review_frequency"] } # Unknown scopes default to HIGH risk return { "scope": scope, "risk_level": "high", "description": "Unknown scope - requires manual classification", "review_frequency": "Quarterly" } def analyze_app_risk(app_permissions): """Calculate aggregate risk score for an application's permissions.""" risk_weights = {"critical": 40, "high": 20, "medium": 10, "low": 2} total_score = 0 classified_scopes = [] for perm in app_permissions: classification = classify_scope_risk(perm["scope"]) classified_scopes.append(classification) total_score += risk_weights.get(classification["risk_level"], 10) # Bonus risk for application (vs delegated) permissions app_type_permissions = [p for p in app_permissions if p["permission_type"] == "Application"] total_score += len(app_type_permissions) * 15 # Bonus risk for admin-consented broad access admin_consent = [p for p in app_permissions if p["consent_type"] == "AllPrincipals"] total_score += len(admin_consent) * 10 if total_score >= 100: aggregate_risk = "CRITICAL" elif total_score >= 60: aggregate_risk = "HIGH" elif total_score >= 30: aggregate_risk = "MEDIUM" else: aggregate_risk = "LOW" return { "total_score": total_score, "aggregate_risk": aggregate_risk, "scope_count": len(app_permissions), "critical_scopes": len([s for s in classified_scopes if s["risk_level"] == "critical"]), "high_scopes": len([s for s in classified_scopes if s["risk_level"] == "high"]), "classified_scopes": classified_scopes } ``` ### Step 3: Identify Over-Permissioned Applications Detect apps requesting more permissions than functionally needed: ```python """ Over-Permission Detection Identifies applications with excessive OAuth scopes relative to their function. """ def detect_over_permissions(inventory, approved_apps_catalog): """ Compare actual permissions against approved scope catalog to find over-permissioned applications. """ findings = [] # Group permissions by application app_permissions = defaultdict(list) for perm in inventory: app_permissions[perm["app_name"]].append(perm) for app_name, permissions in app_permissions.items(): # Check against approved catalog approved = approved_apps_catalog.get(app_name) if not approved: # Unknown/unapproved application findings.append({ "app_name": app_name, "finding_type": "UNAPPROVED_APPLICATION", "severity": "HIGH", "detail": f"Application not in approved catalog with {len(permissions)} permission grants", "scopes": [p["scope"] for p in permissions], "recommendation": "Review and approve or revoke all permissions" }) continue approved_scopes = set(approved.get("approved_scopes", [])) actual_scopes = set(p["scope"] for p in permissions) # Find excessive scopes (granted but not approved) excessive = actual_scopes - approved_scopes if excessive: risk = analyze_app_risk([p for p in permissions if p["scope"] in excessive]) findings.append({ "app_name": app_name, "finding_type": "EXCESSIVE_SCOPES", "severity": risk["aggregate_risk"], "detail": f"{len(excessive)} scopes beyond approved list", "excessive_scopes": list(excessive), "approved_scopes": list(approved_scopes), "recommendation": "Remove excessive scopes or update approved catalog" }) # Find unused scopes (approved but activity logs show no API calls) # This requires API activity log correlation unused = approved_scopes - actual_scopes if unused: findings.append({ "app_name": app_name, "finding_type": "UNUSED_APPROVED_SCOPES", "severity": "LOW", "detail": f"{len(unused)} approved scopes not currently granted", "unused_scopes": list(unused) }) # Check for overly broad permissions broad_patterns = [ ("Mail.ReadWrite", "Mail.Read", "Write access to mail when only read needed"), ("Files.ReadWrite.All", "Files.Read.All", "Write access to all files when only read needed"), ("Directory.ReadWrite.All", "Directory.Read.All", "Write access to directory when only read needed"), ("User.ReadWrite.All", "User.Read.All", "Write access to users when only read needed"), ] for broad, narrow, description in broad_patterns: if broad in actual_scopes: findings.append({ "app_name": app_name, "finding_type": "OVERLY_BROAD_SCOPE", "severity": "MEDIUM", "detail": description, "current_scope": broad, "recommended_scope": narrow, "recommendation": f"Downgrade from {broad} to {narrow}" }) return findings ``` ### Step 4: Audit Token Usage and Detect Stale Grants Identify OAuth tokens that are no longer actively used: ```python """ Token Usage Audit Analyzes sign-in logs and API activity to identify stale OAuth grants. """ def audit_token_usage(auditor, days_inactive=90): """Identify OAuth grants with no recent API activity.""" # Get sign-in activity for service principals url = f"{auditor.base_url}/auditLogs/signIns" params = { "$filter": f"createdDateTime ge {(datetime.utcnow() - timedelta(days=days_inactive)).isoformat()}Z and signInEventTypes/any(t: t eq 'servicePrincipal')", "$top": 999 } active_apps = set() while url: response = requests.get(url, headers=auditor.headers, params=params) data = response.json() for signin in data.get("value", []): active_apps.add(signin.get("appId")) url = data.get("@odata.nextLink") params = {} # Compare against all granted apps all_grants = auditor.get_oauth2_permission_grants() sp_map = {sp["id"]: sp for sp in auditor.get_all_service_principals()} stale_grants = [] for grant in all_grants: sp = sp_map.get(grant["clientId"], {}) app_id = sp.get("appId") if app_id and app_id not in active_apps: stale_grants.append({ "app_name": sp.get("displayName", "Unknown"), "app_id": app_id, "scopes": grant.get("scope", "").split(), "consent_type": grant.get("consentType"), "is_third_party": sp.get("appOwnerOrganizationId") != auditor.tenant_id, "days_inactive": days_inactive, "recommendation": "Revoke - no API activity in {days_inactive} days" }) return sorted(stale_grants, key=lambda x: len(x["scopes"]), reverse=True) ``` ### Step 5: Generate Remediation Plan and Execute Scope Reduction Create and execute the scope minimization remediation plan: ```python """ OAuth Scope Remediation Generates and executes scope reduction actions. """ def generate_remediation_plan(findings, stale_grants): """Create prioritized remediation plan.""" plan = [] # Priority 1: Revoke unapproved applications for f in findings: if f["finding_type"] == "UNAPPROVED_APPLICATION": plan.append({ "priority": 1, "action": "REVOKE_ALL_PERMISSIONS", "app_name": f["app_name"], "reason": "Unapproved third-party application", "impact": f"Removes {len(f['scopes'])} permission grants", "risk_if_not_addressed": "CRITICAL" }) # Priority 2: Remove excessive scopes from approved apps for f in findings: if f["finding_type"] == "EXCESSIVE_SCOPES": plan.append({ "priority": 2, "action": "REMOVE_EXCESSIVE_SCOPES", "app_name": f["app_name"], "scopes_to_remove": f["excessive_scopes"], "reason": "Scopes beyond approved catalog", "risk_if_not_addressed": f["severity"] }) # Priority 3: Downgrade overly broad scopes for f in findings: if f["finding_type"] == "OVERLY_BROAD_SCOPE": plan.append({ "priority": 3, "action": "DOWNGRADE_SCOPE", "app_name": f["app_name"], "current_scope": f["current_scope"], "target_scope": f["recommended_scope"], "reason": f["detail"], "risk_if_not_addressed": "MEDIUM" }) # Priority 4: Revoke stale grants for grant in stale_grants: plan.append({ "priority": 4, "action": "REVOKE_STALE_GRANT", "app_name": grant["app_name"], "scopes_to_revoke": grant["scopes"], "reason": f"No API activity in {grant['days_inactive']} days", "risk_if_not_addressed": "MEDIUM" }) return sorted(plan, key=lambda x: x["priority"]) def execute_scope_reduction(auditor, grant_id, scopes_to_remove): """Remove specific scopes from an OAuth permission grant.""" # Get current grant url = f"{auditor.base_url}/oauth2PermissionGrants/{grant_id}" response = requests.get(url, headers=auditor.headers) current_grant = response.json() current_scopes = set(current_grant.get("scope", "").split()) updated_scopes = current_scopes - set(scopes_to_remove) if not updated_scopes: # Remove entire grant requests.delete(url, headers=auditor.headers) return {"action": "grant_deleted", "grant_id": grant_id} else: # Update with reduced scopes update_body = {"scope": " ".join(updated_scopes)} requests.patch(url, headers=auditor.headers, json=update_body) return { "action": "scopes_reduced", "grant_id": grant_id, "removed": list(scopes_to_remove), "remaining": list(updated_scopes) } ``` ## Key Concepts | Term | Definition | |------|------------| | **OAuth Scope** | Permission string defining the specific API access level granted to a client application (e.g., Mail.Read, Files.ReadWrite.All) | | **Delegated Permission** | OAuth scope exercised on behalf of a signed-in user, limited by both the app's permissions and the user's own access rights | | **Application Permission** | OAuth scope granted directly to the application without user context, providing access to all users' data (high risk) | | **Admin Consent** | Tenant-wide permission grant made by an administrator that applies to all users without individual consent | | **Scope Minimization** | Security principle of reducing OAuth permissions to the minimum set required for application functionality | | **Stale Grant** | OAuth permission that remains active but has no recent API usage, indicating the integration is abandoned or deprecated | ## Tools & Systems - **Microsoft Entra Admin Center**: Portal for reviewing enterprise applications, consent permissions, and OAuth grant management - **Nudge Security**: SaaS security platform for discovering OAuth grants, assessing third-party risk, and automating scope reviews - **Cerby**: Non-SSO application management platform for auditing OAuth integrations and managing shared accounts - **Microsoft Graph API**: Programmatic interface for enumerating and modifying OAuth permission grants at scale ## Common Scenarios ### Scenario: Post-Breach OAuth Scope Audit **Context**: After a phishing attack compromised an admin account, investigation reveals the attacker registered a malicious OAuth application with Mail.ReadWrite and Files.ReadWrite.All scopes, exfiltrating 6 months of email. The organization needs a comprehensive OAuth scope review. **Approach**: 1. Immediately revoke all OAuth grants from the compromised admin session 2. Enumerate all service principals and permission grants across the tenant 3. Flag all applications registered in the last 90 days for manual review 4. Classify all third-party application scopes using the risk framework 5. Identify applications with critical scopes (Mail.ReadWrite, Files.ReadWrite.All, Directory.ReadWrite.All) 6. Cross-reference against approved application catalog from IT procurement 7. Revoke all unapproved applications immediately 8. Downgrade over-permissioned approved applications to minimum required scopes 9. Implement admin consent workflow to prevent future uncontrolled OAuth grants 10. Enable consent policy requiring admin approval for high-risk scopes **Pitfalls**: - Revoking permissions for business-critical integrations without coordination causes service disruption - Not checking for application-level permissions (vs delegated) which are higher risk and often overlooked - Missing multi-tenant applications where the publisher tenant differs from the consuming tenant - Not implementing ongoing monitoring to detect new unauthorized OAuth grants after remediation ## Output Format ``` OAUTH SCOPE MINIMIZATION REVIEW REPORT ========================================= Tenant: corp.onmicrosoft.com Review Period: 2026-02-01 to 2026-02-24 Total Applications: 147 Third-Party Apps: 98 First-Party Apps: 49 PERMISSION INVENTORY Total OAuth Grants: 487 Delegated Permissions: 312 Application Permissions: 175 Admin-Consented: 89 User-Consented: 223 RISK CLASSIFICATION Critical Risk Apps: 7 - UnknownCRMApp (Mail.ReadWrite, Files.ReadWrite.All - UNAPPROVED) - LegacySync (Directory.ReadWrite.All - EXCESSIVE) - DevToolX (Application.ReadWrite.All - OVERLY BROAD) High Risk Apps: 18 Medium Risk Apps: 34 Low Risk Apps: 88 FINDINGS Unapproved Applications: 12 (REVOKE IMMEDIATELY) Excessive Scopes: 23 apps with scopes beyond approved list Overly Broad Permissions: 15 apps that can be downgraded Stale Grants (90+ days): 31 apps with no recent API activity REMEDIATION PLAN Priority 1 (Immediate): 12 unapproved app revocations Priority 2 (This Week): 23 excessive scope removals Priority 3 (This Month): 15 scope downgrades Priority 4 (Next Quarter): 31 stale grant revocations Estimated Scope Reduction: 34% of total permissions ``` --- Source attribution: mukul975 Original project: https://github.com/mukul975/Anthropic-Cybersecurity-Skills/blob/54a798831d2266a3ca61ce68a7acb80b81160d57/skills/performing-oauth-scope-minimization-review/SKILL.md License: Apache-2.0 License information: https://www.apache.org/licenses/LICENSE-2.0 Original upstream instructions; downloaded from Mega AI Hub. ## Upstream license notice Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. 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See the License for the specific language governing permissions and limitations under the License. # Mega AI Hub resource metadata Creator / publisher: mukul975 Original project: https://github.com/mukul975/Anthropic-Cybersecurity-Skills/blob/54a798831d2266a3ca61ce68a7acb80b81160d57/skills/performing-oauth-scope-minimization-review/SKILL.md Attribution basis: Source repository record Fields of work: Data & Analytics, Development & Engineering, Legal, Operations Roles: Business Process Analyst, Compliance Officer, Data Analyst, IT Operations, Security Engineer Specialties: API, Testing Tools: Jwt.Io Country applicability: Country not specified Classification basis: Source catalog labels Instruction SHA-256: e0d6858d093e3a8d12377e0f9db7314405b2b95f95b4256b522acc1065ed3ad2