What’s Vulnerable › Vulnerabilities

CVE-2021-20840

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-24 · updated 2026-06-17
• Weakness: CWE-79

Description

Cross-site scripting vulnerability in Booking Package - Appointment Booking Calendar System versions prior to 1.5.11 allows a remote attacker to inject an arbitrary script via unspecified vectors.

Affected products

• SaasProject Booking Package: before 1.5.11 — fixed in 1.5.11

How to fix

Upgrade to a fixed version: SaasProject Booking Package 1.5.11. Check the vendor advisory for mitigations.

References

• https://jvn.jp/en/jp/JVN68066589/index.html
• https://saasproject.net/ja/fixed/20211019.php
• https://wordpress.org/plugins/booking-package/
• https://jvn.jp/en/jp/JVN68066589/index.html
• https://saasproject.net/ja/fixed/20211019.php
• https://wordpress.org/plugins/booking-package/

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