---
id: CVE-2026-2520
title: >-
  The Online Scheduling and Appointment Booking System – Bookly plugin for
  WordPress is vulnerable to unauthorized modification of data due to a missing
  capability check on the 'updateAddon' function in all versions up to, and
  including, 2…
summary: >-
  The Online Scheduling and Appointment Booking System – Bookly plugin for
  WordPress is vulnerable to unauthorized modification of data due to a missing
  capability check on the 'updateAddon' function in all versions up to, and
  including, 2…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L'
cwe:
  - CWE-862
vendor: ladela
product: Online Scheduling and Appointment Booking System – Bookly
affected:
  - online_scheduling_and_appointment_booking_system_bookly <= 27.2
published: '2026-09-08'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T13:17:18.997'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-2520'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/trunk/lib/PluginsUpdater.php#L10
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/bookly-responsive-appointment-booking-tool/trunk/lib/PluginsUpdater.php#L105
    label: security@wordfence.com
  - url: 'https://plugins.trac.wordpress.org/changeset/3504922/'
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/b7edc69b-363d-49df-b82b-a9ad4fe9224a?source=cve
    label: security@wordfence.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-08T12:01:06.633610Z'
ingestedAt: '2026-09-08T15:33:26.983Z'
epss: 0.00212
epssPercentile: 0.10211
---

## Overview

The Online Scheduling and Appointment Booking System – Bookly plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the 'updateAddon' function in all versions up to, and including, 27.2. This makes it possible for authenticated attackers, with Subscriber-level access and above, to update any plugin with a main file of 'main.php' to its latest version.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.