WordPress Plugin "Booking Package - Appointment Booking Calendar System" vulnerable to cross-site scripting


WordPress Plugin "Booking Package - Appointment Booking Calendar System" provided by Saasproject contains a cross-site scripting vulnerability (CWE-79) due to the flaw in handling some URL query parameters.

Gen Sato of Mitsui Bussan Secure Directions, 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 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

  • Booking Package - Appointment Booking Calendar System prior to 1.5.11


An arbitrary script may be executed on the web browser of the user who is accessing the website 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-2021-20840

  1. JVN : JVN#68066589
Revision History

  • [2021/11/10]
      Web page was published