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.

Published · last modified .

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.

EPSS exploit prediction

EPSS: 0.003 (27.6th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.6% 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-2026-87891: held from 0.003 to 0.003.

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

Affected products

  • Rox Appointment Booking

Weakness classification (CWE)

References

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.