Movable Type vulnerable to cross-site scripting


Movable Type provided by Six Apart, Ltd. is a content management system. Movable Type contains a cross-site scripting vulnerability (CWE-79).

ASAI Ken 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 6.1 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Changed
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: None
CVSS V2 Severity:
Base Metrics 4.3 (Medium) [IPA Score]
  • Access Vector: Network
  • Access Complexity: Medium
  • Authentication: None
  • Confidentiality Impact: None
  • Integrity Impact: Partial
  • Availability Impact: None
Affected Products

Six Apart, Ltd.
  • Movable Type versions prior to Ver. 6.3.1


An arbitrary script may be executed on the user's web browser.

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

[Apply a Workaround]
If you continue to use older version that does not contains a fix for this vulnerability, apply the following workaround to mitigate the impact of this vulnerability.
Delete the directory listed below.

Vendor Information

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

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

  1. CVE-2018-0672

  1. JVN : JVN#89550319
  2. National Vulnerability Database (NVD) : CVE-2018-0672
Revision History

  • [2018/08/30]
      Web page was published
  • [2019/07/25]
      References : Content was added