CVE-2026-56336 Capgo CVE debrief

Who should care

Defenders responsible for Capgo tenants, especially those using the affected endpoint, should assess their exposure and potential risks associated with this vulnerability. They should prioritize verifying exposure of Capgo tenants to this vulnerability and assess the impact of potential reconnaissance. Security teams and vulnerability management teams should review the supplied official advisory or CVE record to validate affected scope, severity, andvendor

Why it matters

CVE-2026-56336 is a medium-severity information disclosure vulnerability in Capgo that allows attackers to enumerate email domains and potentially build mappings of domains to organization UUIDs and SSO provider identifiers, enabling reconnaissance against Capgo tenants. Defenders should prioritize verifying exposure of Capgo tenants to this vulnerability and assess the impact of potential reconnaissance.

• Potential reconnaissance against Capgo tenants
• Information disclosure through enumeration of email domains
• Possible mapping of domains to organization UUIDs and SSO provider identifiers

Technical summary

The vulnerability exists in the unauthenticated /private/sso/check-domain endpoint of Capgo, allowing attackers to obtain internal org_id and provider_id values by enumerating email domains. This could enable reconnaissance against Capgo tenants. The vulnerability has a medium severity and defenders should prioritize verifying exposure of Capgo tenants to this vulnerability. The affected product deployments should be reviewed to assess potential risks associated with this vulnerability. The CVE record and NVD entry provide details on the vulnerability.

Defensive priority

Defenders should prioritize verifying exposure of Capgo tenants to this vulnerability, especially those using the affected endpoint.

Recommended defensive actions

• Verify exposure of Capgo tenants to this vulnerability
• Assess the impact of potential reconnaissance against Capgo tenants
• Consider implementing compensating controls to mitigate potential risks
• Review 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
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance

Evidence notes

The CVE record and NVD entry provide details on the vulnerability. However, additional information from the vendor and other sources may be necessary to fully understand the impact and mitigation strategies.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.