CVE-2021-20840 json
Cross-site scripting vulnerability in Booking Package - Appointment Booking Calendar System versions prior to 1.5.11 allows a remote attack…
published 2021-11-24 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-8252
- cvss
- 6.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.3%
- EPSS 1.3% chance of exploitation in 30 days, percentile 70%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- saasproject booking_package 1.5.11
Exploit prediction
1.28% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
Affected products
- Saasproject Booking Package - Appointment Booking Calendar System
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
-
saasproject.net
/ja/fixed/20211019.php
vendor-advisory
-
wordpress.org
/plugins/booking-package/
product
-
jvn.jp
/en/jp/JVN68066589/index.html
third-party-advisory
Sources
- CVE List CVE-2021-20840
- NVD CVE-2021-20840
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