Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2026-86839
Unknown Online Scheduling and Appointment Booking System — Bookly < 28.3 - Staff+ Appointment and Payment Disclosure, Modification and Deletion via IDOR
AV AC PR UI S C I A CVSS EPSS %ile KEV
N L H N U L L N 3.8 .0015 3.8 —
AFFECTED
Product Versions Fixed
Online Scheduling and Appointment Booking System unspecified —
TIMELINE
Sep 8 Reserved by WPScan
Sep 27 Published (CNA: WPScan)
Sep 28 EXPLOIT PUBLISHED — CVE-2026-86839 (Unknown Online Scheduling and Appointment Booking System). Public exploit reference added.
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.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| September 8, 2026 | Reserved | Reserved by WPScan |
| September 27, 2026 | Published | Published (CNA: WPScan) |
| September 28, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-86839 (Unknown Online Scheduling and Appointment Booking System). Public exploit reference added. |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| Unknown | Online Scheduling and Appointment Booking System | — | — | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-86839 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
