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Appointment Hour Booking <= 1.5.94 — Unauthenticated Appointment Slot Capacity Bypass

CVE-2026-86475Published · Updated

Action summary

Affected: ≤1.5.94Update to 1.5.95 or newer

All remediation steps
Watch plugin
Severity
Medium5.3
CVSS
5.3
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:N Privileges required
None
UI:N User interaction
None
S:U Scope
Unchanged
C:N Confidentiality
None
I:L Integrity
Low
A:N Availability
None
Weakness
CWE-602 Client-Side Enforcement of Server-Side Security
Required access
No account needed
Exploit prediction (EPSS)
0.3% chance in 30 days24th percentile
CISA KEV
Not listed
On this page8

Am I affected?

Appointment Hour Booking – Booking Calendar appointment-hour-booking

  1. Affected≤ 1.5.94
  2. Patched in1.5.95

Update to 1.5.95 or newer.

You are affected if you run ≤ 1.5.94. Version 1.5.95 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Appointment Hour Booking – Booking Calendar.
  • No admin access? Run a passive check of your site. It reads public files only.
  • No account is needed to exploit this. Treat any exposed site on an affected version as at risk.

What to do

  1. Update to version 1.5.95, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch Appointment Hour Booking – Booking Calendar to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Nicat Sultanov.

The Appointment Hour Booking plugin for WordPress is vulnerable to Payment Bypass in all versions up to, and including, 1.5.94. This is due to the double-booking verification only checking the first appointment in a multi-appointment submission (`apps[0]`) rather than iterating over all submitted appointments. This makes it possible for unauthenticated attackers to book appointments beyond the configured slot capacity by submitting multiple appointments in a single booking request, bypassing slot availability restrictions entirely.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

More in Appointment Hour Booking – Booking Calendar

All 16
More vulnerabilities in Appointment Hour Booking – Booking Calendar
SeverityVulnerabilityCVEPublished
High7.2Unauthenticated Stored DOM-Based Cross-Site Scripting via Booking Form Single-Line Field via Schedule Calendar List Renderer
≤1.5.97Update to 1.5.98
CVE-2026-96573
Medium5.3Missing Authorization
≤1.5.94Update to 1.5.95
CVE-2026-66679
Medium5.3Unauthenticated Price Manipulation
≤1.5.87Update to 1.5.88
CVE-2026-16282
Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤1.5.86Update to 1.5.87
CVE-2026-65514
Medium4.4Authenticated (Administrator+) Stored Cross-Site Scripting via 'Min/Max Length' Field Configuration
≤1.5.60Update to 1.5.61
CVE-2026-1083

Timeline

  1. CVE published

    Severity medium, CVSS 5.3

  2. Record last updated

Sources & licenses

Wordfence record
Vulnerability data
Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
CVE® identifiers
Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
EPSS
Exploit Prediction Scoring System by FIRST.org.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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