Capgo SSO Provisioning providers.ts assertion

Summaryinfo

A vulnerability classified as critical was found in Capgo. Affected is an unknown function of the file supabase/functions/_backend/private/sso/providers.ts of the component SSO Provisioning. Such manipulation leads to assertion. This vulnerability is listed as CVE-2026-88864. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Capgo (version unknown). It has been rated as critical. Affected by this issue is an unknown function of the file supabase/functions/_backend/private/sso/providers.ts of the component SSO Provisioning. The manipulation with an unknown input leads to a assertion vulnerability. Using CWE to declare the problem leads to CWE-617. The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Capgo (capgo.app) fails to restrict direct write access to the public.sso_providers table exposed through Supabase PostgREST. A holder of an ordinary Capgo full API key can insert a row with status='active' and enforce_sso=true, bypassing the intended backend SSO provisioning route (supabase/functions/_backend/private/sso/providers.ts) and its controls: the Enterprise plan requirement, SSO provider creation via the Supabase Management API, DNS TXT domain-ownership verification, the pending_verification → verified → active status transition, and issuance of a trusted provider ID by Supabase Auth. The forged row is trusted by SSO discovery and enforcement logic, including the unauthenticated login preflight endpoint /private/sso/check-domain, which then reports {"has_sso": true, "enforce_sso": true} for domains that were never verified, allowing attacker-controlled SSO enforcement to be asserted for arbitrary domains and disrupting normal login. All versions are affected; at the time of the advisory no patch was available.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-88864 since 09/10/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/10/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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• Capgo

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CPE 2.2info

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