[Japanese]

JVNDB-2026-000118

Multiple vulnerabilities in acmailer

Overview

acmailer provided by Extra Innovation Inc. contains multiple vulnerabilities listed below:
  • Cross-site Scripting (CWE-79) - CVE-2026-66358
  • Incorrect Authorization (CWE-863) - CVE-2026-70408
CVE-2026-66358
Yuji Tounai of Mitsui Bussan Secure Directions, Inc. and Fumiya Funakoshi reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

CVE-2026-70408
Fumiya Funakoshi reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.
CVSS Severity (What is CVSS?)

CVSS V3 Severity:
Base Metrics 8.8 (High) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: Low
  • User Interaction: None
  • Scope: Unchanged
  • Confidentiality Impact: High
  • Integrity Impact: High
  • Availability Impact: High
CVSS v4 Severity
Base Metrics: 8.7 (High) [IPA Score]
  • Access Vector (AV): Network
  • Attack Complexity (AC): Low
  • Attack Requirements (AT): None
  • Privileges Required (PR): Low
  • User Interaction (UI): None
    • Vulnerable System Impact
  • Confidentiality Impact (VC): High
  • Integrity Impact (VI): High
  • Availability Impact (VA): High
    • Subsequent System Impact
  • Confidentiality Impact (SC): None
  • Integrity Impact (SI): None
  • Availability Impact (SA): None
The above CVSS base scores have been assigned for CVE-2026-70408

CVSS v3 Severity
Base Metrics: 6.1(Medium) [IPA Score]
  • Access Vector : Network
  • Attack Complexity : Low
  • Privileges Required : None
  • User Interaction : Required
  • Scope : Changed
  • Confidentiality Impact : Low
  • Integrity Impact : Low
  • Availability Impact : None
CVSS v4 Severity
Base Metrics: 5.1 (Medium) [IPA Score]
  • Access Vector (AV): Network
  • Attack Complexity (AC): Low
  • Attack Requirements (AT): None
  • Privileges Required (PR): None
  • User Interaction (UI): Active
    • Vulnerable System Impact
  • Confidentiality Impact (VC): None
  • Integrity Impact (VI): None
  • Availability Impact (VA): None
    • Subsequent System Impact
  • Confidentiality Impact (SC): Low
  • Integrity Impact (SI): Low
  • Availability Impact (SA): None
The above CVSS base scores have been assigned for CVE-2026-66358
Affected Products


Extra Innovation Inc.
  • acmailer CGI versions prior to ver.4.1.2
  • acmailer DB versions prior to ver.1.2.2

Impact

  • An arbitrary script may be executed in the web browser of the user (CVE-2026-66358).
  • A sub-account user could create another sub-account that has administrative privileges (CVE-2026-70408).
Solution

[Update the Software]
Update the software to the latest version according to the information provided by the developer.
Vendor Information

Extra Innovation Inc.
CWE (What is CWE?)

  1. Permissions(CWE-264) [IPA Evaluation]
  2. Cross-site Scripting(CWE-79) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2026-66358
  2. CVE-2026-70408
References

  1. JVN : JVN#47716829
Revision History

  • [2026/08/19]
      Web page was published

Date Public2026/08/19
Date First Published2026/08/19
Date Last Updated2026/08/19