---
id: CVE-2026-56336
title: >-
  Capgo before 12.128.2 contains an information disclosure vulnerability in the
  unauthenticated /private/sso/check-domain endpoint that returns internal
  org_id and provider_id values
summary: >-
  Capgo before 12.128.2 contains an information disclosure vulnerability in the
  unauthenticated /private/sso/check-domain endpoint that returns internal
  org_id and provider_id values. Attackers can enumerate email domains to build
  mappings…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-200
vendor: Capgo
product: Capgo
affected:
  - Capgo < 12.128.2
published: '2026-07-12'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T18:16:50.870'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-56336'
references:
  - url: 'https://github.com/Cap-go/capgo/security/advisories/GHSA-c5jf-5wxg-mgrq'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/capgo-information-disclosure-via-unauthenticated-sso-check-domain-endpoint
    label: disclosure@vulncheck.com
  - url: 'https://github.com/Cap-go/capgo/security/advisories/GHSA-c5jf-5wxg-mgrq'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-07-14T14:10:42.740477Z'
epss: 0.00343
epssPercentile: 0.25105
ingestedAt: '2026-07-12T12:20:14.038Z'
---

## Overview

Capgo before 12.128.2 contains an information disclosure vulnerability in the unauthenticated /private/sso/check-domain endpoint that returns internal org_id and provider_id values. Attackers can enumerate email domains to build mappings of domains to organization UUIDs and SSO provider identifiers, enabling reconnaissance against Capgo tenants.

## Remediation

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