What is CVE-2026-87891?

CVE-2026-87891 is a medium-severity vulnerability in Rox Appointment Booking, classified under Improper Access Control. CVSS score: 6.5/10. Published 2026-09-12.

How severe is CVE-2026-87891?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Rox Appointment Booking

CVE-2026-87891

The Rox Appointment Booking WordPress plugin before 1.2.0 does not perform any capability or authorization check when saving its holiday schedule, allowing unauthenticated attackers to overwrite the dates the booking system treats as unavailable, which can block legitimate bookings or open dates the site owner intended to keep closed.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.

Affected products

Unknown Rox Appointment Booking

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

contact@wpscan.com (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-87891?: CVE-2026-87891 is a medium-severity vulnerability in Rox Appointment Booking, classified under Improper Access Control. CVSS score: 6.5/10. Published 2026-09-12.
How severe is CVE-2026-87891?: Medium severity. CVSS v3 base score is 6.5 out of 10.