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CVE-2026-86841— Bookly 23.2 - 28.2 - Bookly Administrator+ PHP Object Injection via Diagnostics Advanced Options

Quick assessment

Affected
Unknown Online Scheduling and Appointment Booking System
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 插件 Online Scheduling and Appointment Booking System 在版本 28.3 之前存在两个安全漏洞：一是未阻止对不受信任输入的反序列化操作，二是未正确将一项特权维护功能限制为仅管理员可用。这导致那些被管理员明确授予自定义预订管理能力的用户，能够注入任意 PHP 对象、覆盖特权站点选项，并读取已存储的集成密钥（secrets）。

AI Predicted 8.1 Difficulty: Moderate EPSS 0.15% · P4
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I. Basic Information for CVE-2026-86841

Vulnerability Information
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Vulnerability Title
Bookly 23.2 - 28.2 - Bookly Administrator+ PHP Object Injection via Diagnostics Advanced Options
Source: CVE Program / CVE List V5
Vulnerability Description
The Online Scheduling and Appointment Booking System WordPress plugin before 28.3 does not prevent deserialization of untrusted input and does not correctly restrict a privileged maintenance feature to administrators, allowing users granted a custom booking-management capability, which an administrator must explicitly assign, to inject arbitrary PHP objects, overwrite privileged site options, and read stored integration secrets.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Unknown Online Scheduling and Appointment Booking System 23.2 ~ 28.3 -

II. Public POCs for CVE-2026-86841

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III. Intelligence Information for CVE-2026-86841

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Other References for CVE-2026-86841 (1)

Same Patch Batch · Unknown · 2026-09-27 · 19 CVEs total

CVE-2026-89006 WPeMatico RSS Feed Fetcher < 2.8.27 - Contributor+ Stored XSS via Feed Import
CVE-2026-84069 WebFacing Email Accounts for cPanel 5.3 - 5.3.6 - Unauthenticated LFI via assets/index.php
CVE-2026-81655 Ad Inserter 2.8.12 - 2.8.18 - Subscriber+ RCE / Stored XSS via Global Custom Fields
CVE-2026-82841 UpdraftPlus 1.23.8 - 1.26.7 - Subscriber+ Remote Storage Credential Disclosure via Migrati
CVE-2026-85002 EmbedPress < 4.6.7 - Contributor+ Stored XSS via Instagram Carousel Block Attributes
CVE-2026-86609 Download Manager Pro < 7.5.6 - Unauthenticated Stored XSS via Email Lock Subscription
CVE-2026-86839 Bookly < 28.3 - Staff+ Appointment and Payment Disclosure, Modification and Deletion via I
CVE-2026-89001 WPeMatico RSS Feed Fetcher < 2.8.27 - Contributor+ Post Publication and Author Spoofing vi
CVE-2026-89003 WPeMatico RSS Feed Fetcher < 2.8.27 - Contributor+ SSRF via Campaign Preview
CVE-2026-96899 Optima Express 8.6.0 - 8.7.5 - Author+ Stored XSS via faq_script
CVE-2026-89000 WPeMatico RSS Feed Fetcher < 2.8.27 - Contributor+ SSRF via Campaign Run
CVE-2026-96896 Malcure Malware Shield < 19.9.7 - Multisite Subsite Admin+ Arbitrary File Write and Deleti
CVE-2026-96897 Optima Express 8.5.0 - 8.7.5 - Unauthenticated Author Account Creation & Application Passw
CVE-2026-96895 WP YouTube Lyte < 1.7.31 - Contributor+ Stored XSS via Embed Block Attributes
CVE-2026-92995 Verge3D <= 4.13.0 - Unauthenticated Product Download Disclosure via v3d_download_file
CVE-2026-92436 Mailchimp for WooCommerce < 6.3 - Unauthenticated Customer Email and Cart Disclosure via I
CVE-2026-97319 PowerPress < 11.17.2 - Contributor+ Stored XSS via Podcast Player Block
CVE-2026-97227 NextScripts: Social Networks Auto-Poster < 4.4.8 - Authenticated Social Account Credential

IV. Related Vulnerabilities

Same product: Online Scheduling and Appointment Booking System
Same vendor: Unknown

V. Comments for CVE-2026-86841

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