Bookly < 28.3 - Staff+ Appointment and Payment Disclosure, Modification and Deletion via IDOR (CVE-2026-86839) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-86839

Bookly < 28.3 - Staff+ Appointment and Payment Disclosure, Modification and Deletion via IDOR

Answer in brief

CVE-2026-86839 records a Unknown severity vulnerability in Bookly < 28.3 - Staff+ Appointment and Payment Disclosure, Modification and Deletion via IDOR. The current sources do not mark it as known exploited. The current feed maps Unknown/Online Scheduling and Appointment Booking System (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 27, 2026Updated Sep 27, 2026Source checked Sep 27, 2026First seen by HOL Sep 27, 2026Material review Sep 27, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Unknown/Online Scheduling and Appointment Booking System (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Unknown/Online Scheduling and Appointment Booking Systemgeneric	>=0 <28.3	28.3

Recommended response

Check inventory. Check lockfiles and deployed manifests for Unknown/Online Scheduling and Appointment Booking System.
Review the reported fix. Update Unknown/Online Scheduling and Appointment Booking System to 28.3 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 27, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 27, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 27, 2026

Sources and claim methodology

Source referencewpscan.com

Upstream source description

The Online Scheduling and Appointment Booking System WordPress plugin before 28.3 does not verify that appointment and payment records requested through its staff-role AJAX actions belong to the requesting staff member, allowing authenticated attackers with a staff-level account to view, modify and delete other staff members' appointments and payments, including the associated customer's personal information.

Quoted source text, attributed separately from HOL analysis.