CVE-2026-56336 Capgo CVE debrief

Who should care

Organizations using Capgo should be aware of this vulnerability and take steps to mitigate it. The vulnerability allows attackers to gather information about Capgo tenants, which could be used for reconnaissance purposes. Security teams and administrators responsible for Capgo deployments should review the CVE record and take necessary actions to protect against this vulnerability.

Technical summary

The vulnerability is located in the unauthenticated /private/sso/check-domain endpoint of Capgo. When exploited, it returns internal org_id and provider_id values. This information can be used by attackers to build mappings of domains to organization UUIDs and SSO provider identifiers, enabling reconnaissance against Capgo tenants. The vulnerability has a CVSS score of 6.9 and is classified as MEDIUM severity. The CVE record does not provide additional technical details on the vulnerability, such as the root cause or potential mitigations.

Defensive priority

Medium

Recommended defensive actions

• Review and update Capgo to version 12.128.2 or later
• Restrict access to the /private/sso/check-domain endpoint
• Monitor for suspicious activity on the /private/sso/check-domain endpoint
• Implement additional security measures to protect against reconnaissance attacks
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-07-12T12:16:45.837Z and has not been modified since then. The NVD entry is currently 6.9 (MEDIUM). The information disclosure vulnerability in Capgo's unauthenticated /private/sso/check-domain endpoint returns internal org_id and provider_id values, allowing attackers to enumerate email domains and build mappings of domains to organization UUIDs and SSO provider identifiers. This vulnerability allows attackers to gather information about Capgo tenants, which could be used for reconnaissance purposes. The CVE record does not provide additional details on the vulnerability, such as the number of affected users or the potential impact on the organization.

Official resources