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TrueBooker <= 1.2.6 — Unauthenticated Authorization Bypass Through User-Controlled Key to Account Takeover to 'truebooker_wp_user_id' Parameter

CVE-2026-18315Published · Updated

Action summary

Affected: ≤1.2.6Update to 1.2.7 or newer

All remediation steps
Watch plugin
Severity
Critical9.8
CVSS
9.8
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:N Privileges required
None
UI:N User interaction
None
S:U Scope
Unchanged
C:H Confidentiality
High
I:H Integrity
High
A:H Availability
High
Weakness
CWE-639 Authorization Bypass Through User-Controlled Key
Required access
No account needed
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

TrueBooker – Appointment Booking and Scheduler System truebooker-appointment-booking

  1. Affected≤ 1.2.6
  2. Patched in1.2.7

Update to 1.2.7 or newer.

You are affected if you run ≤ 1.2.6. Version 1.2.7 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under TrueBooker – Appointment Booking and Scheduler System.
  • No admin access? Run a passive check of your site. It reads public files only.
  • No account is needed to exploit this. Treat any exposed site on an affected version as at risk.

What to do

  1. Update to version 1.2.7, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch TrueBooker – Appointment Booking and Scheduler System to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Décio Brandão.

The TrueBooker – Appointment Booking and Scheduler System plugin for WordPress is vulnerable to Authorization Bypass Through User-Controlled Key leading to Account Takeover in all versions up to, and including, 1.2.6. This is due to the admin_user_create_cus AJAX handler lacking any authentication or capability check before passing the attacker-supplied truebooker_wp_user_id parameter directly to wp_update_user. This makes it possible for unauthenticated attackers to overwrite the email address of any WordPress user — including an administrator — and then complete the standard WordPress lost-password flow to fully take over the targeted account.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

More in TrueBooker – Appointment Booking and Scheduler System

All 25
More vulnerabilities in TrueBooker – Appointment Booking and Scheduler System
SeverityVulnerabilityCVEPublished
Medium5.31.2.9 - Unauthenticated Information Exposure
1.1.9 – 1.2.9Update to 1.3.0
CVE-2026-94229
Medium5.31.2.9 - Missing Authorization
1.1.9 – 1.2.9Update to 1.3.0
CVE-2026-94230
Medium5.31.2.9 - Missing Authorization
1.1.9 – 1.2.9Update to 1.3.0
CVE-2026-94231
Medium5.31.2.9 - Missing Authorization
1.1.9 – 1.2.9Update to 1.3.0
CVE-2026-94228
Medium5.3Missing Authorization to Unauthenticated Settings Update
≤1.2.9Update to 1.3.0
CVE-2026-39798

Timeline

  1. CVE published

    Severity critical, CVSS 9.8

  2. Record last updated

Sources & licenses

Wordfence record
Vulnerability data
Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
CVE® identifiers
Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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