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TI-2026-59371 Aliases CVE-2026-86839GHSA-36wf-cx88-gfjh

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

Priority LOW 17CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-639.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00169 6th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed Online Scheduling and Appointment Booking System (Unknown): 28.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
UnknownOnline Scheduling and Appointment Booking Systembefore 28.328.3Patch availableCNA
  • Online Scheduling and Appointment Booking System VendorUnknown Affected before 28.3 Fixed in 28.3 Patch available CNA

Remediation

  • Fix · CNA Online Scheduling and Appointment Booking System (Unknown) Fixed in 28.3

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Online Scheduling and Appointment Booking System 28.3

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-59373 Bookly 23.2 - 28.2 - Bookly Administrator+ PHP Object Injection via Diagnostics Advanced OptionsPriority LOW 21
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-86839
  2. 2026-10-03 Alias added: GHSA-36wf-cx88-gfjh

References

Exploit 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences