Reported vulnerability
Bookly <= 21.7 - Authenticated (Admin+) Stored Cross-Site Scripting
Published 1 Jun 2023
Updated 22 Jan 2024
CVE-2023-1159
Compare your installed software with the affected versions below. Follow the source’s remediation guidance and test an available update after taking a backup. A database entry describes a reported issue; it does not establish whether a particular website has been compromised.
Does this affect my version?
Check your installed version against this advisory. This compares the report’s version ranges and does not scan your website.
Wordfence advisory
medium · CVSS 4The Bookly plugin for WordPress is vulnerable to Stored Cross-Site Scripting via service titles in versions up to, and including, 21.5 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers with administrative privileges to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
Severity vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:L/A:N
Online Scheduling and Appointment Booking System – Bookly
- Software
- plugin · bookly-responsive-appointment-booking-tool
- Affected versions
- From 21.7, through 21.7
- Fix availability
- Fix available
- Fixed versions
- 21.8
Recommended action
Update to version 21.8, or a newer patched version
Further references (1)
Data sources and licences
Copyright 2012-2026 Defiant Inc.
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CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.
Read licence termsSource: Wordfence
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Get help checking your site, applying an available update and resolving any problems after updating.
Get help with this issueQuestions about this vulnerability
Which versions of Online Scheduling and Appointment Booking System – Bookly are affected?
Wordfence lists these affected versions: From 21.7, through 21.7. Use the version checker above to compare your installed release with this report.
Is a fix available for Online Scheduling and Appointment Booking System – Bookly?
Wordfence reports a fix for this issue in Online Scheduling and Appointment Booking System – Bookly. It lists these fixed versions: 21.8. Back up your website and test the recommended update before applying it to your live site.
Where can I find my installed plugin version?
In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.
Does an affected version mean my website has been hacked?
An affected version means the installed release matches a vulnerability described in this report. It does not show whether anyone has exploited it on your website. The checker compares version numbers with stored reports; it does not inspect your website.
Other reports for the same product
These reports cover at least one of the same plugins, themes or WordPress core. Check each report’s affected versions separately.
- Online Scheduling and Appointment Booking System <= 28.2 - Authenticated (Custom+) PHP Object Injection via 'value' ParameterUpdated 10 Oct 2026
- Online Scheduling and Appointment Booking System <= 28.4 - Insecure Direct Object Reference to Authenticated (Subscriber+) Privilege Escalation via 'id' and 'wp_user_id' Parameters via Query String / JSON BodyUpdated 10 Oct 2026
- Online Scheduling and Appointment Booking System <= 28.4 - Unauthenticated Sensitive Information Exposure in 'phone' Parameter to bookly_render_detailsUpdated 14 Oct 2026
- Bookly <= 28.2 - Authenticated (Staff+) Insecure Direct Object ReferenceUpdated 30 Sept 2026
- Bookly 23.2 - 28.2 - Authenticated (Bookly Administrator+) PHP Object InjectionUpdated 30 Sept 2026