Vulnerability in Appointment Booking Calendar Plugin And Scheduling

CVE-2026-76586

The Appointment Booking Calendar Plugin and Scheduling Plugin WordPress plugin before 1.6.3 does not verify the amount actually paid against the server-side price staged for a booking when confirming an online payment, allowing unauthenticated users to have a paid appointment approved for a fraction of its price.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (27.7th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.7% 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-2026-76586: held from 0.002 to 0.004.

EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002

Affected products

  • Appointment Booking Calendar Plugin And Scheduling

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-76586?
CVE-2026-76586 is a high-severity vulnerability in Appointment Booking Calendar Plugin And Scheduling, classified under Improper Access Control. CVSS score: 7.5/10. Published 2026-08-29.
How severe is CVE-2026-76586?
High severity. CVSS v3 base score is 7.5 out of 10.