EUVD-2026-38096
GHSA-4q75-4379-394h
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable PostgREST RPC callable with a public anon key (PR:N, AC:L, UI:N); impact is tampering with billing rows so I:H, with no confidentiality or availability loss.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Cross-tenant billing log tampering in Capgo (Cap-go/capgo) before 12.128.2 allows unauthenticated attackers holding only the public Supabase publishable anon key to insert or overwrite build_logs rows for arbitrary organizations via the SECURITY DEFINER PostgREST RPC public.record_build_time. Because the function is granted to the anon role and uses ON CONFLICT (build_id, org_id) DO UPDATE, attackers can inflate or alter another tenant's billable build time, producing financial-impact denial of service. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires only (1) network reachability to a Capgo instance's Supabase PostgREST endpoint and (2) possession of that instance's publishable Supabase anon key (sb_publishable_*), which is by design embedded in client apps and therefore not a secret. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector AV:N/AC:L/AT:N/PR:N/UI:N with VI:H and VC/VA:N (score 8.7) is internally consistent: the flaw is reachable over the network from an unauthenticated client using a key (sb_publishable_*) that is by design public, requires no user interaction, and produces a high integrity impact (tenant billing data tampering) without directly affecting confidentiality or availability of the database itself. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker obtains a target Capgo tenant's publishable Supabase anon key (trivially recoverable from the app's client-side bundle or any public API call) and issues a PostgREST RPC call to public.record_build_time with the victim's org_id and an attacker-chosen build_id and inflated build_time value. By replaying the call with the same (build_id, org_id) pair, the ON CONFLICT DO UPDATE clause lets the attacker repeatedly overwrite the victim's billing row, driving up the victim's billable build minutes or zeroing them out. … |
| Remediation | Vendor-released patch: upgrade Capgo to 12.128.2 or later, per the GitHub Security Advisory GHSA-42xj-3h9w-26h5 (https://github.com/Cap-go/capgo/security/advisories/GHSA-42xj-3h9w-26h5), which corrects the access control on public.record_build_time. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
24 hours: Identify all Capgo deployments and verify versions; flag instances before 12.128.2 for urgent patching. …
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Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
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External POC / Exploit Code
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