WordPress Plugin "Quiz And Survey Master" vulnerable to cross-site scripting


WordPress Plugin "Quiz And Survey Master" provided by ExpressTech contains a cross-site scripting vulnerability (CWE-79) due to the flow in handling some URL query parameters.

Gen Sato of Mitsui Bussan Secure Directions, Inc. reported this vulnerability to the developer and coordinated on his own.
After coordination was completed, this case was reported to JPCERT/CC, and JPCERT/CC coordinated with the developer for the publication.
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 2.6 (Low) [IPA Score]
  • Access Vector: Network
  • Access Complexity: High
  • Authentication: None
  • Confidentiality Impact: None
  • Integrity Impact: Partial
  • Availability Impact: None
Affected Products

  • Quiz And Survey Master versions prior to 7.1.14


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

[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-2021-20792

  1. JVN : JVN#65388002
Revision History

  • [2021/08/10]
      Web page was published