# CVE-2026-56339

## Summary

- **CVE ID:** CVE-2026-56339
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-203
- **Published:** Jul 15, 2026
- **Last Modified:** Jul 15, 2026

## Description

Capgo (Cap-go/capgo) before 12.128.2 contains an information disclosure vulnerability in the Supabase PostgREST SECURITY DEFINER RPC function public.rescind_invitation that allows unauthenticated attackers to enumerate organization existence. The function returns distinct error messages (NO_ORG vs NO_RIGHTS) when called with only a publishable API key, enabling attackers to discover valid organization IDs and increase the attack surface for targeted phishing or social engineering campaigns.

## Affected Products

- Cap-go — capgo (0)
- Cap-go — capgo (12.128.2)

## References

- [CNA](https://github.com/Cap-go/capgo/security/advisories/GHSA-8432-3cgm-vw5j)
- [CNA](https://www.vulncheck.com/advisories/capgo-unauthenticated-organization-existence-enumeration-via-rescind-invitation-rpc)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.46%
- **EPSS Percentile:** 38.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._