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Vulnerabilities

Vulnerability · CVE-2026-18315

Authorization Bypass Through User-Controlled Key

Published Oct 13, 2026 · catalog updated Oct 13, 2026 · TrueBooker – Appointment Booking and Scheduler System

Patch now

CVE-2026-18315 is in the CISA known-exploited catalog. Confirm TrueBooker – Appointment Booking and Scheduler System against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Unknown—
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
0.60%
Remediation
Remediation guidance
Affected products
stated TrueBooker – Appointment Booking and Scheduler System · vendor themetechmount TrueBooker – Appointment Booking and Scheduler System

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-p

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • stated TrueBooker – Appointment Booking and Scheduler System<= 1.2.6
  • vendor themetechmount TrueBooker – Appointment Booking and Scheduler Systemversion unspecified

How to fix CVE-2026-18315

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-18315 is in the CISA known-exploited catalog. Confirm TrueBooker – Appointment Booking and Scheduler System against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with TrueBooker – Appointment Booking and Scheduler System <= 1.2.6. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 0.60%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WordPress security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · VulnCheck KEV

    Detected

    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

  2. Oct 13, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Sources

  • CVE.orgVulnerability recordCVE-2026-18315

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-18315

    30-day exploitation probability 0.6%

    first.org
  • VulnCheck KEVConfirmed exploitationCVE-2026-18315

    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

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.