What is CVE-2026-56339?

CVE-2026-56339 is a high-severity vulnerability in Cap-Go Capgo, classified under Observable Discrepancy. CVSS score: 7.5/10. Published 2026-07-15.

How severe is CVE-2026-56339?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Cap-Go Capgo

CVE-2026-56339

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.

EPSS: 0.005 (37.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Cap-go Capgo — versions 0, 12.128.2

Weakness classification (CWE)

CWE-203 — Observable Discrepancy

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-56339?: CVE-2026-56339 is a high-severity vulnerability in Cap-Go Capgo, classified under Observable Discrepancy. CVSS score: 7.5/10. Published 2026-07-15.
How severe is CVE-2026-56339?: High severity. CVSS v3 base score is 7.5 out of 10.