WordPress plugin "Fudousan plugin" series vulnerable to cross-site scripting


Some of WordPress plugin "Fudousan plugin" series provided by nendeb contain a cross-site scripting vulnerability (CWE-79).

Yu Iwama of Secure Sky Technology Inc. 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 5.4 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: Low
  • User Interaction: Required
  • Scope: Changed
  • Confidentiality Impact: Low
  • Integrity Impact: Low
  • Availability Impact: None
CVSS V2 Severity:
Base Metrics 4.0 (Medium) [IPA Score]
  • Access Vector: Network
  • Access Complexity: Low
  • Authentication: Single Instance
  • Confidentiality Impact: None
  • Integrity Impact: Partial
  • Availability Impact: None
Affected Products

The following products and versions of "Fudousan plugin" series are affected.

  • Fudousan Plugin 5.7.0 and earlier
  • Fudousan Plugin Pro Single-User 5.7.0 and earlier
  • Fudousan Plugin Pro Multi-User 5.7.0 and earlier


An arbitrary script may be executed on the web browser of the user who accessed the site using the product.

[Update the plugin]
Update the plugin according to the information provided by the developer.
Vendor Information

CWE (What is CWE?)

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

  1. CVE-2021-20749

  1. JVN : JVN#93799513
Revision History

  • [2021/06/22]
      Web page was published