Vulnerability · Published Jun 19, 2026 · Assigned by VulnCheck

CVE-2026-56082Capgo - Unauthenticated Cross-Tenant Billing Log Tampering via public.record_build_time RPC

High 7.5

In plain English

A high-severity improper access control 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 0.4% (higher than 31% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.4%top 68.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Capgo (Cap-go/capgo) before 12.128.2 contains an improper access control vulnerability in the SECURITY DEFINER PostgREST RPC function public.record_build_time, which is granted to the anon role and callable with only the public Supabase publishable (sb_publishable_*) anon key. An unauthenticated attacker can insert rows into public.build_logs for arbitrary organizations and, because the function uses ON CONFLICT (build_id, org_id) DO UPDATE, can overwrite existing usage/billing records by reusing the same build_id for a target org. This enables cross-tenant tampering of billing build logs and financial-impact denial of service by inflating billable build time.

Affected products (as reported)

Vendor	Product	Versions
Cap-go	capgo	0 – before 12.128.2

Weakness: CWE-284 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

GHSA Advisory GHSA-42xj-3h9w-26h5 vendor-advisory
VulnCheck Advisory: Supabase - Unauthenticated Cross-Tenant Billing Log Tampering via public.record_build_time RPC third-party-advisory