CVE-2026-100612 Capgo SSO Provider ID Authentication Bypass via Incomplete Migration
An org_admin can hijack an organization owner's account by modifying the SSO provider ID to point to a malicious identity provider, bypassing authentication controls.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-100612?
CVE-2026-100612 is a high-severity authentication bypass vulnerability in Cap-go capgo.app, published on 26 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Capgo (capgo.app) through version 12.261.0 contains an incomplete access-control fix for the public.sso_providers table. Migration 20260826100000_sso_providers_block_direct_active_insert.sql installs a BEFORE UPDATE guard (enforce_sso_provider_client_update_guard()) that freezes only the dns_verified_at, domain, status and enforce_sso columns; provider_id (as well as metadata_url and attribute_mapping) is left writable. Because the table is granted ALL to the anon and authenticated roles with no column-level restriction, and PostgreSQL row-level security policies such as allow_org_admins_update_sso_providers constrain only which row may be updated and not which columns, a user holding the org_admin tier permission org.update_settings can PATCH provider_id over PostgREST to an identity provider under their control. Since provider_id is the trust anchor binding an email domain to an authorized IdP, the attacker can then authenticate through their own IdP while asserting the org owner's email; the server-side provider match succeeds and the merge routine attaches the attacker's SSO identity to the existing owner account, nulls its password, and deletes its other identities and sessions. This results in vertical privilege escalation from org_admin to org owner/super_admin, account takeover, and lockout of the legitimate owner. Exploitation requires that the target organization has an active SSO provider configured and that the attacker already holds org_admin in that organization. No patched version is available.
Weakness: CWE-639
Which versions are affected by CVE-2026-100612?
How do I fix CVE-2026-100612?
No fix has been published for CVE-2026-100612 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-100612 being exploited?
There is no known exploitation of CVE-2026-100612 in the wild and no public exploit code.
Sources
Also known as GHSA-553q-8vcm-9vxv, GHSA-jpjp-v827-j4gc.