Vulnerability · Published Jun 20, 2026 · Assigned by VulnCheck

CVE-2026-56235Capgo - Unauthenticated Cross-Tenant Metrics Disclosure via RPC Functions

Medium 5.3

In plain English

A medium-severity information exposure in capgo from Cap-go. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.3%top 71.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Cap-go capgo before 12.128.2 contains an authorization bypass in several Supabase PostgREST RPC functions (get_app_metrics, get_global_metrics, get_total_metrics) that are granted to the anon role without enforcing org membership or permission checks. An unauthenticated attacker using only the public Supabase API key (sb_publishable_*) can query arbitrary org_id values to disclose cross-tenant usage telemetry (MAU, bandwidth, installs, gets), enumerate app IDs for a target org, and determine org existence via an oracle (valid org returns metrics, invalid returns []).

Affected products (as reported)

Vendor	Product	Versions
Cap-go	capgo	0 – before 12.128.2

Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References

GHSA Advisory GHSA-gfpq-vphf-6gcm vendor-advisory
VulnCheck Advisory: Capgo - Unauthenticated Cross-Tenant Metrics Disclosure via RPC Functions third-party-advisory