What is CVE-2026-11866?

CVE-2026-11866 is a medium-severity vulnerability in Appointment Booking Plugin, classified under Cross-Site Request Forgery (CSRF). CVSS score: 5.4/10. Published 2026-07-16.

How severe is CVE-2026-11866?

Medium severity. CVSS v3 base score is 5.4 out of 10.

CSRF in Appointment Booking Plugin

CVE-2026-11866

The Appointment Booking Plugin WordPress plugin before 5.6.3 does not validate a CSRF nonce on several state-changing actions handled by its central request dispatcher, allowing attackers to perform privileged actions, such as overwriting…

Vulnerability class: CSRF (Cross-Site Request Forgery)

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L.

Affected products

Unknown Appointment Booking Plugin — versions 0

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

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

Frequently asked questions

What is CVE-2026-11866?: CVE-2026-11866 is a medium-severity vulnerability in Appointment Booking Plugin, classified under Cross-Site Request Forgery (CSRF). CVSS score: 5.4/10. Published 2026-07-16.
How severe is CVE-2026-11866?: Medium severity. CVSS v3 base score is 5.4 out of 10.