EUVD-2026-43170
GHSA-fcmv-mqrc-fr3c
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/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
Network-exploitable with no meaningful auth barrier (publishable key is semi-public); impact is limited to low confidentiality via app ID enumeration only.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/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
Cap-go before 12.128.2 contains an information disclosure vulnerability in the public.transfer_app RPC function that returns distinct error messages for existing versus non-existing app IDs. Unauthenticated attackers can enumerate valid app IDs by observing error message differences when calling transfer_app with only the publishable API key.
AnalysisAI
Information disclosure in Capgo (Cap-go) before 12.128.2 allows unauthenticated network attackers to enumerate valid app IDs by observing differential error responses from the public.transfer_app RPC endpoint, requiring only a publishable API key. The root cause is a CWE-203 observable discrepancy: the endpoint returns distinguishable error messages depending on whether a supplied app ID exists or not, functioning as an existence oracle. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a publishable API key for the Capgo platform, which is a semi-public credential class designed to be distributed with client applications - obtaining one is low-friction for any Capgo user or anyone with access to a distributed mobile app built on Capgo. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 6.9 with vector AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N correctly reflects a remotely exploitable, low-complexity issue with no privilege or interaction requirements, but limited confidentiality impact and no integrity or availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker obtains a publishable Capgo API key - either from a publicly distributed mobile app bundle, a leak, or by registering a free account - and writes a simple script to iterate over candidate app IDs, calling the transfer_app RPC for each. By parsing the distinct error messages returned for existing versus non-existing IDs, the attacker builds a map of valid app IDs hosted on the Capgo platform, which can then be used to target specific applications or their OTA update mechanisms. … |
| Remediation | Upgrade Capgo to version 12.128.2 or later, which is confirmed as the first patched release per the vendor advisory at https://github.com/Cap-go/capgo/security/advisories/GHSA-fmm3-3qcg-85j6. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-203 – Observable Discrepancy
View allSame technique Information Disclosure
View allShare
External POC / Exploit Code
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