Medium severity6.1NVD Advisory· Published Nov 24, 2021· Updated Jun 17, 2026

CVE-2021-20840

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

WordPress/Booking Packagellm-fuzzy
Range: <1.5.11
Package: https://wordpress.org/plugins/booking-package
Saasproject/Booking Package Appointment Booking Calendar Systemv5
Range: versions prior to 1.5.11

Patches

Vulnerability mechanics

References

jvn.jp/en/jp/JVN68066589/index.htmlnvdThird Party Advisory
saasproject.net/ja/fixed/20211019.phpnvdVendor Advisory
wordpress.org/plugins/booking-package/nvdProduct

News mentions

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cvss	0.397
epss	0.001
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000