CVE-2026-56339 Capgo - Unauthenticated Organization Existence Enumeration via rescind_invitation RPC
Unauthenticated attackers can enumerate valid organization IDs via distinct error messages in the rescind_invitation RPC, facilitating targeted phishing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-56339?
CVE-2026-56339 is a high-severity vulnerability in Cap-go capgo, published on 15 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-203
Which versions are affected by CVE-2026-56339?
How do I fix CVE-2026-56339?
No fix has been published for CVE-2026-56339 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-56339 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56339 exists.
Sources
Also known as GHSA-8432-3cgm-vw5j, GHSA-q5cf-73cv-r7f2.