Read the docs
TI-2026-40465 Aliases CVE-2026-56073GHSA-g359-4vg7-88hp

Cap-go - OTP Bypass via Response Manipulation in Email Verification

Priority HIGH 81CWE-345Published · 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 · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-345.

Summary

Cap-go before 12.128.2 contains an authentication bypass vulnerability in OTP verification that allows attackers to bypass email verification by modifying server responses. Attackers can intercept OTP verification requests and manipulate HTTP responses to falsely mark verification successful, enabling unauthorized 2FA enablement and account takeover.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00229 13th 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-2026-40473 Cap-go - Account Lockout via 2FA Misconfiguration on Unverified EmailPriority 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-2026-56073
  2. 2026-10-03 Alias added: GHSA-g359-4vg7-88hp

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-2026-64782 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