[Japanese]

JVNDB-2026-000076

Movable Type vulnerable to missing authorization

Overview

Movable Type provided by Six Apart Ltd. contains the following vulnerability.
  • Missing authorization (CWE-862) - CVE-2026-44392
Six Apart Ltd. reported this vulnerability to JPCERT/CC to notify users of its solution through JVN. JPCERT/CC and Six Apart Ltd. coordinated under the Information Security Early Warning Partnership.
CVSS Severity (What is CVSS?)

CVSS V3 Severity:
Base Metrics 4.3 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: Low
  • User Interaction: None
  • Scope: Unchanged
  • Confidentiality Impact: None
  • Integrity Impact: Low
  • Availability Impact: None
CVSS v4 Severity
Base Metrics: 5.3 (Medium) [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): None
  • Integrity Impact (VI): Low
  • Availability Impact (VA): None
    • Subsequent System Impact
  • Confidentiality Impact (SC): None
  • Integrity Impact (SI): None
  • Availability Impact (SA): None
Affected Products


Six Apart, Ltd.
  • Movable Type 9.1.1 and earlier (9.1 series)
  • Movable Type 9.0.7 and earlier (9.0 series)
  • Movable Type 8.8.3 and earlier (8.8 series)
  • Movable Type 8.0.10 and earlier (8.0 series)
  • Movable Type Advanced 9.1.1 and earlier (9.1 series)
  • Movable Type Advanced 9.0.7 and earlier (9.0 series)
  • Movable Type Advanced 8.8.3 and earlier (8.8 series)
  • Movable Type Advanced 8.0.10 and earlier (8.0 series)
  • Movable Type Premium 9.1.1 and earlier (9.1 series)
  • Movable Type Premium 9.0.7 and earlier (9.0 series)
  • Movable Type Premium 2.15 and earlier (included in Movable Type 8.8.4 and earlier or Movable Type 8.0.11 and earlier)
  • Movable Type Premium (Advanced Edition) 9.1.1 and earlier (9.1 series)
  • Movable Type Premium (Advanced Edition) 9.0.7 and earlier (9.0 series)
  • Movable Type Premium (Advanced Edition) 2.15 and earlier (included in Movable Type 8.8.4 and earlier or Movable Type 8.0.11 and earlier)

Impact

Under certain conditions, when a user without administrator privileges signs in to the product, unintended update processing may be executed.
Solution

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

Six Apart, Ltd.
CWE (What is CWE?)

  1. No Mapping(CWE-Other) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2026-44392
References

  1. JVN : JVN#56484285
Revision History

  • [2026/05/20]
      Web page was published

Date Public2026/05/20
Date First Published2026/05/20
Date Last Updated2026/05/20