EUVD-2026-63798
GHSA-j97h-fj62-m9pp
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
Credentials are in publicly distributed software (PR:N, AC:L); I:L added because activation server impersonation enables license bypass, a direct integrity impact on Yamaha's authorization system.
Primary rating from Vendor (jpcert).
CVSS VectorVendor: jpcert
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
Use of hard-coded credentials issue exists in VOCALOID6 , which may allow an attacker to impersonate a legitimate VOCALOID6 Editor and gain access to Yamaha's activation and content servers.
AnalysisAI
Hard-coded credentials embedded in VOCALOID6 by Yamaha Corporation allow an attacker to impersonate a legitimate VOCALOID6 Editor client and authenticate to Yamaha's backend activation and content delivery servers. The CVSS:3.1/AV:N/AC:L/PR:N/UI:N vector indicates this is network-exploitable without authentication or user interaction, as the credentials are distributed within publicly available client software. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Practical exploitation requires obtaining the VOCALOID6 client binary (publicly available via retail or download) and performing reverse engineering to extract the embedded credentials - a one-time effort that does not require privileged access to any system. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 5.3 Medium score is supported by the AV:N/AC:L/PR:N/UI:N vector, indicating low-friction network exploitation with no prerequisites on the attacker's side beyond obtaining the client binary. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker obtains a copy of the publicly distributed VOCALOID6 installer or application binary and uses a reverse-engineering tool such as a disassembler or debugger to locate and extract the embedded hard-coded credentials used for authenticating to Yamaha's activation and content servers. The attacker then crafts HTTP or protocol-level requests that replicate the legitimate VOCALOID6 Editor client communication, authenticating to Yamaha's backend using the extracted credentials to bypass license activation checks or access protected content libraries without a valid purchase. … |
| Remediation | The primary remediation is to upgrade to a patched version of VOCALOID6 once released by Yamaha Corporation; monitor the official download page at https://www.vocaloid.com/en/support/download/ for updated releases and consult the JPCERT/CC advisory at https://jvn.jp/en/vu/JVNVU90210212/ for the confirmed fix version. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-798 – Use of Hard-coded Credentials
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today