EUVD-2026-38741Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/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-reachable Supabase REST with any non-admin API key (PR:L, AC:L); secret disclosure gives C:H, forged webhooks give I:L, no availability impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/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 allows non-admin API keys to read webhook signing secrets via Supabase REST due to insufficient row-level security policies on the webhooks table. Attackers can retrieve the webhook secret and forge valid X-Capgo-Signature headers to send authenticated webhook events to configured receivers, breaking webhook authenticity and integrity.
AnalysisAI
Webhook signing secret disclosure in Capgo prior to 12.128.2 allows authenticated holders of non-admin API keys to read the webhook signing secret directly from the Supabase REST-exposed webhooks table because row-level security policies are too permissive. Once obtained, the secret lets the attacker forge valid X-Capgo-Signature headers and submit spoofed webhook events to any configured receiver, undermining webhook authenticity and integrity. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid non-admin Capgo API key (PR:L) and network reachability to the Supabase REST endpoint of a Capgo instance running a version before 12.128.2 with the default row-level security policies on the webhooks table; no user interaction, no admin role, and no special configuration on the victim side are needed beyond having webhook receivers configured. … 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:L/UI:N/VC:H/VI:L) accurately reflects the real risk: network-reachable, low-complexity, authenticated-with-a-non-admin-key, no user interaction, with high confidentiality impact on the leaked secret and low integrity impact via forged webhooks. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has obtained any non-admin Capgo API key - for example a key scoped to a single app, a leaked CI token, or a malicious tenant on a shared deployment - issues a Supabase REST query against the webhooks table and reads back the signing secret. They then craft an arbitrary webhook payload, compute a valid X-Capgo-Signature HMAC with the stolen secret, and POST it to the customer's configured webhook receiver, which trusts it as a legitimate Capgo event and triggers downstream actions such as deployment, billing, or notification logic. |
| Remediation | Vendor-released patch: upgrade Capgo to 12.128.2 or later, which tightens the row-level security policies on the webhooks table so that the signing secret is no longer readable via non-admin API keys; the advisory is published at https://github.com/Cap-go/capgo/security/advisories/GHSA-qrrx-x3qf-x87v. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
24 hours: Inventory all non-admin API keys in use and identify personnel/applications holding them; rotate all webhook signing secrets immediately. …
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Same weakness CWE-200 – Information Exposure
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External POC / Exploit Code
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