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TI-2026-13508 Aliases CVE-2026-16142GHSA-76x4-wpvp-whc4

Authorization bypass in themetechmount TrueBooker – Appointment Booking and Scheduler…

Priority MEDIUM 50CWE-639Published · Updated

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 plugin for WordPress is vulnerable to Account Takeover in all versions up to, and including, 1.2.6. This is due to the add_front_user_update() AJAX handler being registered for unauthenticated users and accepting an arbitrary truebooker_wp_user_id value, which is passed directly to wp_update_user() without verifying authentication or ownership. This makes it possible for unauthenticated attackers to change any WordPress user account email address, including an administrator, by submitting the target user ID and an attacker-controlled email address. An attacker can then use the native WordPress password reset flow to receive the reset link at the attacker-controlled email address and take over the account.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00663 51st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

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

VendorProductAffected versionsFixed inStatusSource
themetechmountTrueBooker – Appointment Booking and Scheduler Systemup to 1.2.6—No fix listedCNA
  • 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

  1. 2026-10-02 Threatist record created from CVE-2026-16142
  2. 2026-10-03 Alias added: GHSA-76x4-wpvp-whc4
  3. 2026-10-06 EPSS moved to the 50th–90th percentile

References

Other 2

  • 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-2026-15066 Authorization bypass in themetechmount TrueBooker – Appointment Booking and Scheduler… CVSS 3.1CRITICAL 9.8
  • TI-2024-06424 TrueBooker < 1.0.3 - Settings Update via CSRF CVSS 3.1MEDIUM 4.3
  • 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
See all 17 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences