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TI-2026-40473 Aliases CVE-2026-56081GHSA-9wvh-mc26-36xw

Cap-go - Account Lockout via 2FA Misconfiguration on Unverified Email

Priority HIGH 81CWE-640Published · Updated

Key facts

Attack vector
Network
Privileges required
None
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-640.

Summary

Cap-go before 12.128.2 contains an authentication logic flaw that lets an attacker register and control an account bound to a victim's email address before that email is verified. By enabling two-factor authentication on the pre-registered account, the attacker gains control over the account claimed under the victim's identity, allowing them to read and modify its state and enforce organization-level policies, while the legitimate user is denied access to the account tied to their own email.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00433 37th percentileScored 2026-11-07
Fix Fixed capgo (Cap-go): 12.128.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

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 (Cap-go) 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 ·

    Cap-go capgo 12.128.2

    4 records Highest priority Priority HIGH 3 HIGH, 1 MEDIUM

    Other records, highest priority first

    • TI-2026-40465 Cap-go - OTP Bypass via Response Manipulation in Email VerificationPriority HIGH 81
    • TI-2026-40474 Capgo - Unauthenticated Cross-Tenant Billing Log Tampering via public.record_build_time RPCPriority HIGH 77
    • TI-2026-40472 Cap-go - Authentication Logic Flaw in Enforce Password PolicyPriority MEDIUM 64
    Show all 4 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-56081
  2. 2026-10-03 Alias added: GHSA-9wvh-mc26-36xw

References

Advisory 1

  • TI-2026-40602 Capgo - Unauthenticated API Key Generation via Client-Side Parameter Manipulation 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
  • TI-2026-40688 Capgo - Unauthenticated Channel Enumeration and App Oracle via GET /channel_self CVSS 4.0HIGH 8.7
See all 124 →

Sources

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