EUVD-2026-38093
GHSA-7hf5-4jq6-894f
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/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
Authenticated low-priv API key over network, no UI; scope changes because leaked HMAC secrets compromise downstream receivers, high confidentiality, no direct integrity/availability on Capgo.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/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 a cross-tenant authorization bypass vulnerability in PostgREST endpoints that allows org-scoped read API keys to access other tenants' webhook secrets and delivery logs. Attackers can query the webhooks and webhook_deliveries endpoints to exfiltrate HMAC signing secrets and delivery payloads, enabling forged webhook events against victim organizations.
AnalysisAI
Cross-tenant data exposure in Capgo before 12.128.2 lets an authenticated org-scoped read API key reach other tenants' PostgREST endpoints and pull HMAC webhook signing secrets plus delivery logs. Disclosed by VulnCheck with a vendor GitHub Security Advisory (GHSA-hj3h-v877-g5rx); no public exploit identified at time of analysis, and the secrets retrieved enable subsequent forgery of authentic-looking webhook events against victim organizations.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Attacker must hold a valid org-scoped read API key on any Capgo organization (PR:L) and reach the PostgREST API over the network; no admin role, MFA bypass, user interaction, or non-default configuration is required. … 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:N/VA:N is internally consistent: a low-privileged API token over the network with no user interaction yields high confidentiality impact and no direct integrity or availability impact on Capgo itself - hence the 7.1 score. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker signs up for a Capgo organization, generates a standard org-scoped read API key, and issues authenticated GET requests against /rest/v1/webhooks and /rest/v1/webhook_deliveries with no tenant filter. PostgREST returns rows belonging to other organizations, including the HMAC signing secret and prior delivery payloads, which the attacker then uses to craft and sign a forged update or billing event that the victim's webhook receiver validates as authentic. |
| Remediation | Vendor-released patch: upgrade Capgo to 12.128.2 or later per GHSA-hj3h-v877-g5rx. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all org-scoped read API keys, document their active use, and revoke any unnecessary keys; assume potential compromise of all keys for risk assessment. …
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Same weakness CWE-200 – Information Exposure
View allSame technique Information Disclosure
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External POC / Exploit Code
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