---
id: CVE-2026-56081
title: Cap-go - Account Lockout via 2FA Misconfiguration on Unverified Email
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-register…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-640
vendor: Cap-go
product: capgo
affected:
  - capgo < 12.128.2
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-06-22T17:48:44.967855Z'
exploitAvailable: true
published: '2026-06-19'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T14:05:29.349Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-56081'
references:
  - url: 'https://github.com/Cap-go/capgo/security/advisories/GHSA-j4cx-5pw6-5v5j'
    label: GitHub Security Advisory (GHSA-j4cx-5pw6-5v5j)
  - url: >-
      https://www.vulncheck.com/advisories/cap-go-account-lockout-via-2fa-misconfiguration-on-unverified-email
    label: >-
      VulnCheck Advisory: Cap-go - Account Lockout via 2FA Misconfiguration on
      Unverified Email
tags:
  - cve.org
  - exploit-available
epss: 0.00433
epssPercentile: 0.37832
ingestedAt: '2026-11-08T14:51:22.371Z'
---

## Overview

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.

## Affected

- `capgo < 12.128.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.