Improper input validation in Appointment Hour Booking

CVE-2026-86475

The Appointment Hour Booking WordPress plugin before 1.5.95 does not check every appointment in a booking submission against the capacity configured for its own slot, allowing unauthenticated visitors to take slots that are already fully booked.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (23.9th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 23.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-86475: held from 0.003 to 0.003.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

  • Appointment Hour Booking

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-86475?
CVE-2026-86475 is a medium-severity vulnerability in Appointment Hour Booking, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2026-09-16.
How severe is CVE-2026-86475?
Medium severity. CVSS v3 base score is 5.3 out of 10.