WordPress Plugin "WPCS - WordPress Currency Switcher" vulnerable to cross-site request forgery


WordPress Plugin "WPCS - WordPress Currency Switcher" provided by realmag777 contains a cross-site request forgery vulnerability (CWE-352).

Mizuki Takagi of Cryptography Laboratory,Department of Information and Communication Engineering,Tokyo Denki University reported and coordinated with the developer to fix this vulnerability.
After coordination was completed, this case was reported to IPA, and JPCERT/CC coordinated with the developer for the publication under 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: None
  • User Interaction: Required
  • Scope: Unchanged
  • Confidentiality Impact: None
  • Integrity Impact: Low
  • Availability Impact: None
CVSS V2 Severity:
Base Metrics 2.6 (Low) [IPA Score]
  • Access Vector: Network
  • Access Complexity: High
  • Authentication: None
  • Confidentiality Impact: None
  • Integrity Impact: Partial
  • Availability Impact: None
Affected Products

  • WPCS - WordPress Currency Switcher 1.1.6 and earlier


If a user views a malicious page while logged in to the affected system with an administrative privilege, unintended operations may be performed.

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

CWE (What is CWE?)

  1. Cross-Site Request Forgery(CWE-352) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2021-20780

  1. JVN : JVN#91372527
Revision History

  • [2021/07/06]
      Web page was published