How to Audit Third-Party Community and Support Platforms Tied to Your SSO

The Hacktron research into OpenAI combined a flaw in community forum software with a weakness in employee validation. Many organizations run similar third-party platforms tied to their SSO. Here is how to audit them.

Step 1: Inventory connected platforms

List platforms that:

Use your SSO (Entra ID enterprise applications, other IdPs).
Grant privileges based on email domain (for example, "anyone with @company.com is staff").
Are public-facing but linked to employee identities: community forums (Discourse, Khoros), support portals (Zendesk, Freshdesk), documentation platforms, developer portals, status pages.

Step 2: Review how identity is established

For each platform:

Does sign-in go through your IdP with MFA, or a local account?
How does the platform decide someone is an employee or administrator — SSO group claims, email domain, manual assignment?
Can a user change their email address and inherit privileges?
Are SAML/OIDC assertions validated correctly (signature, audience, issuer)?

Step 3: Tighten

Require SSO with Conditional Access for staff and admin roles.
Use group claims from Entra ID for privilege assignment, not email domains.
Disable local admin accounts or protect them with strong MFA.
Require email verification for any email change, and don't grant privileges based on unverified addresses.

Step 4: Patch and monitor

Keep platform software updated (self-hosted Discourse and similar apps need routine patching).
Stream platform admin logs to your SIEM where possible.

Step 5: Test

Include connected platforms in penetration tests and bug bounty scope.

Verify

Every connected platform has an owner, SSO with MFA for privileged roles and documented privilege logic.