Vulnerability in Booking For Appointments And Events Calendar

CVE-2026-77689

The Booking for Appointments and Events Calendar WordPress plugin before 9.8.1 does not verify that a payment was actually taken before recording a booking as paid, trusting the payment gateway named in a public, unauthenticated booking request even when the site has never configured that gateway. This lets an unauthenticated attacker obtain confirmed, fully paid appointments and events without any payment being collected.

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 (22.9th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 22.9% 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-2026-77689: held from 0.003 to 0.003.

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

Affected products

  • Booking For Appointments And Events Calendar

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-77689?
CVE-2026-77689 is a medium-severity vulnerability in Booking For Appointments And Events Calendar, classified under Improper Access Control. CVSS score: 5.3/10. Published 2026-09-12.
How severe is CVE-2026-77689?
Medium severity. CVSS v3 base score is 5.3 out of 10.