EUVD-2026-38099
GHSA-5495-g4j9-gjwq
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/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 RPC with public anon key warrants PR:N; cross-tenant write to another tenant's namespace constitutes a scope change (S:C) with low integrity-only impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/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 before 12.128.2 contains an authorization bypass vulnerability in the public.upsert_version_meta SECURITY DEFINER function exposed via PostgREST RPC, allowing unauthenticated attackers to insert arbitrary rows into version_meta for any app_id. Attackers can exploit this by calling the RPC endpoint with a public anon key to poison storage metrics, causing persistent false data in dashboards and triggering incorrect alerts across victim applications.
AnalysisAI
Cross-tenant metrics poisoning in Capgo before 12.128.2 allows unauthenticated remote attackers to insert arbitrary rows into the version_meta table for any tenant's app_id by invoking the PostgREST RPC endpoint using only the public anonymous key. The root cause is a missing authorization check inside a SECURITY DEFINER PostgreSQL function, which executes with elevated definer privileges while accepting caller-supplied app_id values without ownership validation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The `public.upsert_version_meta` function must be exposed as a PostgREST RPC endpoint - the default configuration in Capgo's Supabase backend. … 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) confirms fully unauthenticated, low-complexity, network-reachable exploitation with no preconditions - the highest possible exploitability profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker extracts the Capgo public anon key from a distributed mobile or web application bundle - requiring no authentication or special access - and sends a crafted HTTP POST request to `/rest/v1/rpc/upsert_version_meta` with a fabricated payload specifying a victim tenant's app_id and inflated storage figures. The SECURITY DEFINER function accepts and persists the forged rows without ownership validation, causing the victim's Capgo dashboard to permanently display corrupted storage metrics and potentially triggering false quota alerts or billing anomalies. |
| Remediation | Upgrade Capgo to version 12.128.2 or later; this is the vendor-released patch confirmed by the GitHub Security Advisory GHSA-g4hx-x8gc-x6rw at https://github.com/Cap-go/capgo/security/advisories/GHSA-g4hx-x8gc-x6rw. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Cross-tenant data poisoning in Supabase Capgo before 12.128.2 allows remote unauthenticated attackers to corrupt billing
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Unauthenticated information disclosure in Capgo before 12.128.2 lets remote attackers query the /functions/v1/channel_se
Account takeover in Capgo before 12.128.2 stems from a password-change endpoint that omits current-password validation (
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Cross-tenant authorization bypass in Capgo before 12.128.2 lets authenticated users impersonate another tenant's limited
Same weakness CWE-862 – Missing Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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