EUVD-2026-38740Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/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
Remote unauthenticated parameter tampering yields arbitrary API keys (PR:N, AC:L); confidentiality and integrity of tenant data fully compromised, availability not affected.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
2DescriptionCVE.org
Capgo before 12.128.2 contains a broken authentication vulnerability in its API key generation mechanism. API keys are exposed in frontend requests, and the backend fails to validate that keys are securely generated and bound to the authenticated user. An attacker can tamper with the API key parameter in the generation request and supply arbitrary values, generating custom API keys without proper authorization, which can lead to unauthorized access to protected endpoints.
AnalysisAI
Authentication bypass in Capgo before 12.128.2 lets remote unauthenticated attackers mint arbitrary API keys by tampering with a client-side parameter in the key generation request, because the backend never validates that keys are server-generated or bound to the authenticated user. The forged keys grant access to protected endpoints, yielding full confidentiality and integrity compromise of tenant data. No public exploit identified at time of analysis, but the flaw is trivially reproducible from any HTTP client.
Technical ContextAI
Capgo is an open-source live-update and over-the-air deployment platform for Capacitor mobile applications, exposing a multi-tenant API for managing apps, channels, and release artifacts. The vulnerability is a textbook CWE-287 (Improper Authentication) instance where the API key generation flow trusts client-supplied input: the frontend submits the desired key value alongside the request, and the backend persists it without enforcing server-side cryptographic generation or binding it to the session principal. CPE coverage (cpe:2.3:a:capgo:capgo:*) indicates all versions prior to 12.128.2 are affected.
RemediationAI
Vendor-released patch: upgrade Capgo to 12.128.2 or later, where the backend now generates API keys server-side and binds them to the authenticated user; see the GHSA-22w2-mx2h-4fr7 advisory for the fix detail. If immediate upgrade is not possible, place the API key generation endpoint behind a reverse-proxy ACL restricted to known admin IPs and rotate/revoke every API key issued by the unpatched instance, since any existing key may have been attacker-chosen (the trade-off is that legitimate clients will need to re-authenticate and obtain new keys). Additionally, audit access logs for unexpected key generation calls and protected-endpoint usage from keys you cannot attribute to a real user.
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Same weakness CWE-287 – Improper Authentication
View allSame technique Authentication Bypass
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External POC / Exploit Code
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