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CVE-2026-88864— Capgo SSO Provider Authentication Bypass via PostgREST Direct Write

Quick assessment

Affected
Cap-go capgo.app
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Capgo (capgo.app) 未能限制通过 Supabase PostgREST 暴露的 表的直接写入访问权限。持有普通 Capgo 完整 API 密钥的用户可以插入一行记录，设置 和 ，从而绕过预期的后端 SSO 配置路径（ ）及其相关控制机制，包括：企业版套餐要求、通过 Supabase Management API 创建 SSO 提供商、DNS TXT 域名所有权验证、从 → → 的状态流转，以及由 Supabase Auth 签发的受信提供商 ID。 这条伪造的记录会被 SSO 发现与强制逻辑所信任，

CVSS 9.1 · Critical
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I. Basic Information for CVE-2026-88864

Vulnerability Information
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Vulnerability Title
Capgo SSO Provider Authentication Bypass via PostgREST Direct Write
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cap-go capgo.app - -

II. Public POCs for CVE-2026-88864

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III. Intelligence Information for CVE-2026-88864

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Vendor Advisories for CVE-2026-88864 (2)

Same Patch Batch · Cap-go · 2026-09-10 · 5 CVEs total

CVE-2026-88862 8.8 HIGH Capgo API Key Manager Authentication Bypass via x-limited-key-id
CVE-2026-88861 8.3 HIGH Capgo AAL1 Session MFA Bypass via Direct RBAC Authorization
CVE-2026-88863 8.1 HIGH capgo.app through 12.207.1 Privilege Escalation via invite_new_user_to_org
CVE-2026-88860 6.3 MEDIUM Capgo Authorization Bypass via Stale Channel Permission Overrides

IV. Related Vulnerabilities

Same product: capgo.app
Same vendor: Cap-go
Same weakness: CWE-284

V. Comments for CVE-2026-88864

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