EUVD-2026-62238
GHSA-w4h6-h99g-8xhr
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/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-reachable privilege escalation requiring a low-privilege account; scope unchanged as impact is confined to the acmailer application with no lateral system compromise.
Primary rating from Vendor (jpcert).
CVSS VectorVendor: jpcert
Lifecycle Timeline
3DescriptionCVE.org
An incorrect authorization vulnerability exists in acmailer, which may allow a user to create a sub-account that has administrative privileges.
AnalysisAI
Incorrect authorization in acmailer enables any authenticated low-privilege user to create a sub-account bearing full administrative privileges, effectively allowing unauthorized privilege escalation within the application. The flaw (CWE-863) bypasses the intended privilege boundary during sub-account creation, granting attackers administrator-level control over the mailing list system without requiring any elevated starting permissions. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid authenticated low-privilege user account on the target acmailer installation, as confirmed by PR:L in the CVSS 4.0 vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 8.7 accurately reflects the real-world severity: network-reachable exploitation at low complexity, requiring only a standard authenticated user account, with full compromise of the vulnerable system's confidentiality, integrity, and availability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary remediation is to apply the patched version of acmailer identified in the vendor's official advisory at https://www.acmailer.jp/info/de.cgi?id=119 and confirmed by the JPCERT/CC bulletin at https://jvn.jp/en/jp/JVN47716829/. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, restrict sub-account creation permissions to verified administrators and disable automated account provisioning if available; audit all administrator accounts created in the past 90 days for unauthorized additions. …
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Same weakness CWE-863 – Incorrect Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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