What’s Vulnerable › Vulnerabilities

CVE-2026-56339: Capgo - Unauthenticated Organization Existence Enumeration via rescind_invitation RPC

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-15 · updated 2026-10-24
• Weakness: CWE-203

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: before 12.128.2 — fixed in 12.128.2

How to fix

Upgrade to a fixed version: Cap-go capgo 12.128.2. Check the vendor advisory for mitigations.

References

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

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