CVE-2021-36847: WordPress Webba Booking plugin <= 4.2.21 - Authenticated Stored Cross-Site Scripting (XSS) vulnerability

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-08-22 · updated 2026-06-17
Weakness: CWE-79

Description

Authenticated (admin+) Stored Cross-Site Scripting (XSS) vulnerability in WebbaPlugins Webba Booking plugin <= 4.2.21 at WordPress.

Affected products

webba-agency Easy Appointment Booking & Scheduling System – Webba Booking Calendar: before 4.2.22 — fixed in 4.2.22

How to fix

Upgrade to a fixed version: webba-agency Easy Appointment Booking & Scheduling System – Webba Booking Calendar 4.2.22. Check the vendor advisory for mitigations.

References

https://patchstack.com/database/vulnerability/webba-booking-lite/wordpress-webba-booking-plugin-4-2-21-authenticated-stored-cross-site-scripting-xss-vulnerability
https://wordpress.org/plugins/webba-booking-lite/#developers
https://patchstack.com/database/vulnerability/webba-booking-lite/wordpress-webba-booking-plugin-4-2-21-authenticated-stored-cross-site-scripting-xss-vulnerability
https://wordpress.org/plugins/webba-booking-lite/#developers

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