EUVD-2026-38742Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/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
Unauthenticated network call to a public RPC (AV:N/AC:L/PR:N/UI:N); writes poison billing data (I:H) and enables quota exhaustion (A:L); no data disclosure (C:N).
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:L/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
Supabase Capgo before 12.128.2 contains an authorization bypass vulnerability in the SECURITY DEFINER record_build_time RPC function that allows unauthenticated attackers to insert arbitrary build-time records. Attackers can exploit this by calling POST /rest/v1/rpc/record_build_time with a public API key to poison billing and quota data for any organization, enabling resource exhaustion and cross-tenant billing manipulation.
AnalysisAI
Cross-tenant data poisoning in Supabase Capgo before 12.128.2 allows remote unauthenticated attackers to corrupt billing and quota records by invoking the SECURITY DEFINER record_build_time RPC with only a public anon API key. The flaw stems from missing authorization inside a privilege-elevated PostgREST function, enabling arbitrary build-time inserts against any organization. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires only network reachability to the Capgo Supabase PostgREST endpoint (/rest/v1/rpc/record_build_time) and possession of the project's public anon API key, which is by design embedded in client apps and therefore not a meaningful secret. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L confirms a network-reachable, low-complexity, unauthenticated attack with high integrity impact on billing/quota data and limited availability impact through resource exhaustion - a realistic alignment with the description. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker harvests the publicly embedded Supabase anon key from any Capgo-using mobile app or web client and issues repeated POST /rest/v1/rpc/record_build_time requests carrying inflated build durations against a competitor's organization ID. This poisons that tenant's quota counters until builds are rejected for over-quota and inflates the victim's invoice, while the attacker pays nothing and remains unauthenticated. |
| Remediation | Vendor-released patch: upgrade Capgo to 12.128.2 or later as published in GHSA-42f8-v563-5763 (https://github.com/Cap-go/capgo/security/advisories/GHSA-42f8-v563-5763), which adds authorization enforcement inside the record_build_time function. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all systems running Supabase Capgo and document current versions. …
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Same weakness CWE-269 – Improper Privilege Management
View allSame technique Privilege Escalation
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External POC / Exploit Code
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