Auth bypass in Truebooker

CVE-2026-18777

The TrueBooker WordPress plugin before 1.2.7 does not have proper authorisation checks in one of its AJAX actions, allowing unauthenticated users to change the status of arbitrary appointments, as well as to trigger notification emails to the affected customers.

Vulnerability class: Broken Access Control

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 (21.0th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.0% 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-2026-18777: held from 0.002 to 0.003.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

  • Truebooker

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-18777?
CVE-2026-18777 is a medium-severity vulnerability in Truebooker, classified under Missing Authorization. CVSS score: 5.3/10. Published 2026-08-19.
How severe is CVE-2026-18777?
Medium severity. CVSS v3 base score is 5.3 out of 10.