Authorization bypass in themetechmount TrueBooker – Appointment Booking and Scheduler…
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-639.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| themetechmount | TrueBooker – Appointment Booking and Scheduler System | up to 1.2.6 | — | No fix listed | CNA |
- TrueBooker – Appointment Booking and Scheduler System Vendorthemetechmount Affected up to 1.2.6 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-18315
- 2026-10-03 Alias added: GHSA-7xx3-2cj6-229w
- 2026-10-21 EPSS moved to the 50th–90th percentile
References
Other 5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/73251a74-5be3-446b-8e0a-ff2d1484c467?source=cve
- https://plugins.svn.wordpress.org/truebooker-appointment-booking/tags/1.2.6/main/function_ajax.php
- https://plugins.svn.wordpress.org/truebooker-appointment-booking/tags/1.2.6/main/config/truebooker-style.php
- https://plugins.svn.wordpress.org/truebooker-appointment-booking/tags/1.2.6/templates/login-register.php
- https://plugins.trac.wordpress.org/changeset/3640018/truebooker-appointment-booking
More themetechmount vulnerabilities
- TI-2024-06423 TrueBooker < 1.0.3 - Multiple Unauthenticated SQLi CVSS 3.1CRITICAL 9.8
- TI-2026-36145 WordPress TrueBooker plugin <= 1.1.9 - Broken Access Control vulnerability CVSS 3.1CRITICAL 9.1
- TI-2024-06424 TrueBooker < 1.0.3 - Settings Update via CSRF CVSS 3.1MEDIUM 4.3
- TI-2026-13508 Authorization bypass in themetechmount TrueBooker – Appointment Booking and Scheduler… CVSS 3.1CRITICAL 9.8
- TI-2026-12146 TrueBooker <= 1.2.3 - Missing Authorization to Unauthenticated Arbitrary Password Reset via 'truebooker_wp_user_id' CVSS 3.1CRITICAL 9.8
- TI-2026-12132 Missing authorization in themetechmount TrueBooker – Appointment Booking and Scheduler… CVSS 3.1CRITICAL 9.8
Sources
- CVE-2026-18315 · CVE Program
- CVE-2026-18315 · NVD
- FIRST EPSS
- GHSA-7xx3-2cj6-229w · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences