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High

WordPress Bookly Plugin <= 28.2 - Authenticated PHP Object Injection

  • Disclosed: 09.10.2026
  • Updated: 13.10.2026 13:54

The Online Scheduling and Appointment Booking System – Bookly plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 28.2. This flaw is caused by the deserialization of untrusted input supplied through the value parameter. Authenticated attackers with custom-level permissions or higher can inject arbitrary PHP objects. Currently, there is no known gadget chain available.

What to do

Update the Bookly plugin (bookly-responsive-appointment-booking-tool) to version 28.3 or later.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
WordPress plugin Online Scheduling and Appointment Booking System – Bookly <= 28.2 28.3

References

CVSS score 7.2/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE)
CWE-502
Platform
WordPress
Package
Online Scheduling and Appointment Booking System – Bookly
Disclosed
09.10.2026
Updated
13.10.2026 13:54

Sources and licenses · Edited or translated by DockRay; source rights and applicable licenses are retained.

Wordfence Intelligence - 56c5e045-e91c-4517-8164-a21c3e99623b - Wordfence Intelligence

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Vulnerability history: Online Scheduling and Appointment Booking System – Bookly

All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (32) in the archive
Total entries
32
First → latest
02.2018 10.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 1
  • High 12
  • Medium 19

Disclosures per year

Severity:
  1. WordPress Bookly Plugin <= 28.2 - Authenticated PHP Object Injection this entry
    High · 7.2 CVE-2026-12626 <= 28.2 28.3
  2. Bookly 23.2 - 28.2 - Authenticated (Bookly Administrator+) PHP Object Injection
    High · 7.5 CVE-2026-86841 >= 23.2, <= 28.2 28.3
  3. Online Scheduling and Appointment Booking System <= 28.2 - Insecure Direct Object Reference to Unauthenticated Arbitrary Booking Token Disclosure and Deletion via 'order_id' Parameter
    Critical · 9.1 CVE-2026-93399 <= 28.2 28.3
  4. Online Scheduling and Appointment Booking System <= 28.1 - Insecure Direct Object Reference to Unauthenticated Sensitive Data Access and Message Injection via 'conversation_id' Parameter
    High · 7.5 CVE-2026-89063 <= 28.1 28.2
  5. Online Scheduling and Appointment Booking System <= 27.7 - Unauthenticated Stored Cross-Site Scripting via bookly_speed_up_update_addons AJAX action
    High · 7.2 CVE-2026-13424 <= 27.7 28.0
  6. Online Scheduling and Appointment Booking System – Bookly < 27.8 - Unauthenticated SQL Injection
    High · 7.5 CVE-2026-13395 < 27.8 27.8
  7. Online Scheduling and Appointment Booking System <= 27.7 - Unauthenticated SQL Injection
    High · 7.5 CVE-2026-14516 <= 27.7 27.8
  8. Online Scheduling and Appointment Booking System – Bookly <= 27.7 - Unauthenticated SQL Injection
    High · 7.5 CVE-2026-61949 <= 27.7 27.8
  9. Online Scheduling and Appointment Booking System – Bookly <= 27.7 - Unauthenticated Stored Cross-Site Scripting
    High · 7.2 CVE-2026-61944 <= 27.7 27.8
  10. Online Scheduling and Appointment Booking System – Bookly <= 27.2 - Unauthenticated Stored Cross-Site Scripting via 'bookly-customer-full-name' Cookie
    High · 7.2 CVE-2026-5513 <= 27.2 27.3
  11. Bookly <= 21.7.1 - Arbitrary File Deletion
    High · 8.1 CVE-2023-26526 <= 21.7.1 21.8
  12. Bookly <= 21.5 - Unauthenticated Stored Cross-Site Scripting via Name
    High · 7.2 CVE-2023-1172 = 21.5 21.5.1
  13. WordPress Online Booking and Scheduling Plugin – Bookly <= 14.5 - Cross-Site Scripting
    High · 7.2 CVE-2018-6891 <= 14.5 14.6

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