What is CVE-2026-18776?

CVE-2026-18776 is a critical-severity vulnerability in Truebooker, classified under Improper Access Control. CVSS score: 9.8/10. Published 2026-08-19.

How severe is CVE-2026-18776?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Truebooker

CVE-2026-18776

The TrueBooker WordPress plugin before 1.2.7 does not have proper authorisation checks in some of its AJAX actions, allowing unauthenticated users to change the email address of arbitrary users, including administrators, and subsequently take over their account via the password reset flow.

Published 2026-08-19 · last modified 2026-08-26.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (40.5th percentile), scored 2026-10-05.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002

Affected products

Truebooker

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

wpscan.com/vulnerability/4b6abb2d-941b-429f-a480-33d1aafad450/ (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-18776?: CVE-2026-18776 is a critical-severity vulnerability in Truebooker, classified under Improper Access Control. CVSS score: 9.8/10. Published 2026-08-19.
How severe is CVE-2026-18776?: Critical severity. CVSS v3 base score is 9.8 out of 10.