EUVD-2026-63799
GHSA-67jp-qgv9-229c
Severity by source
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/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
Local named-pipe access requires an existing same-account session (PR:L, AV:L); no integrity or availability impact is described, only limited confidentiality gain.
Primary rating from Vendor (jpcert).
CVSS VectorVendor: jpcert
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/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
3DescriptionCVE.org
Missing authentication for critical function vulnerability exists in VOCALOID6. Any process running under the same local user account as a running VOCALOID6 Editor instance may escalate privileges via a local named pipe.
AnalysisAI
Local named-pipe privilege escalation in Yamaha VOCALOID6 exposes privileged Editor functions to any co-resident process running under the same local user account, requiring no additional authentication. The flaw (CWE-306, Missing Authentication for Critical Function) stems from the VOCALOID6 Editor's local named pipe lacking access controls, allowing a low-privileged process owned by the same OS user to communicate with it directly. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires three concurrent conditions: the attacker must already possess a low-privileged account on the target machine (PR:L); a VOCALOID6 Editor instance must be actively running under that same user account at the time of attack; and the attacker's process must be co-resident under the identical OS user session. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 3.3 (Low) reflects the constrained exploitation scenario: AV:L (local machine access required), AC:L (no special conditions beyond the product running), PR:L (attacker already holds a local user account), UI:N (no victim interaction needed), S:U (scope unchanged), and C:L/I:N/A:N (limited confidentiality impact only, no integrity or availability degradation). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with an existing low-privileged local session on a workstation where VOCALOID6 Editor is actively running opens a handle to the unauthenticated named pipe and issues privileged IPC commands, accessing functions or data within VOCALOID6 that would otherwise be gated. No public proof-of-concept code has been identified at time of analysis, and the attack is confined to the same OS user account context. |
| Remediation | Patch available per vendor advisory - consult the Yamaha VOCALOID support and download page at https://www.vocaloid.com/en/support/download/ for the patched release; an exact fixed version number is not independently confirmed from the available reference data. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same technique Authentication Bypass
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External POC / Exploit Code
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