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TI-2026-40588 Aliases CVE-2026-56223

Capgo - Account Takeover via Cross-Domain SSO Email Assertion in provision-user

Priority HIGH 73CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-287.

Summary

Capgo before 12.128.2 contains a cross-domain SSO account takeover vulnerability in the provision-user endpoint that allows attackers to merge arbitrary victim accounts based on email match without validating SSO provider domain authorization. An attacker with enterprise org admin access and a malicious IdP can forge SAML assertions containing victim email addresses to trigger account merge and gain full access to victim accounts, organizations, and data.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00402 34th percentileScored 2026-11-07
Fix Fixed Capgo (Capgo): 12.128.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CapgoCapgobefore 12.128.212.128.2Patch availableCNA
  • Capgo VendorCapgo Affected before 12.128.2 Fixed in 12.128.2 Patch available CNA

Remediation

  • Fix · CNA Capgo (Capgo) Fixed in 12.128.2

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Capgo 12.128.2

    10 records Highest priority Priority HIGH 7 HIGH, 3 MEDIUM

    Other records, highest priority first

    • TI-2026-40602 Capgo - Unauthenticated API Key Generation via Client-Side Parameter ManipulationPriority HIGH 81
    • TI-2026-40597 Capgo - Subkey Scope Bypass in middlewareKey via x-limited-key-id HeaderPriority HIGH 73
    • TI-2026-40703 Capgo - Denial of Service in 2FA Email Verification via /auth/v1/otp EndpointPriority HIGH 70
    Show all 10 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-56223

References

Advisory 1

  • TI-2026-40602 Capgo - Unauthenticated API Key Generation via Client-Side Parameter Manipulation CVSS 4.0CRITICAL 9.3
  • TI-2026-40473 Cap-go - Account Lockout via 2FA Misconfiguration on Unverified Email CVSS 4.0CRITICAL 9.3
  • TI-2026-40465 Cap-go - OTP Bypass via Response Manipulation in Email Verification CVSS 4.0CRITICAL 9.3
  • TI-2026-64782 capgo.app through 12.129.0 Cache Restoration of Deleted Bundles CVSS 4.0HIGH 8.7
  • TI-2026-40704 Capgo - Unauthenticated Organization Existence Enumeration via rescind_invitation RPC CVSS 4.0HIGH 8.7
  • TI-2026-40689 Capgo - Rate Limit Bypass via User-Controlled device_id Parameter CVSS 4.0HIGH 8.8
See all 124 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences