CVE-2026-18777
Deferred Deferred - Pending Action

Unauthenticated Appointment Status Change in TrueBooker WordPress Plugin

Publication date: 2026-08-19

Last updated on: 2026-08-26

Assigner: WPScan

Description
The TrueBooker WordPress plugin before 1.2.7 does not have proper authorisation checks in one of its AJAX actions, allowing unauthenticated users to change the status of arbitrary appointments, as well as to trigger notification emails to the affected customers.

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Meta Information

Published
2026-08-19
Last Modified
2026-08-26
Generated
2026-09-08
AI Q&A
2026-08-19
EPSS Evaluated
2026-09-07
NVD
CVE-2026-18777
EUVD
EUVD-2026-62282

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
truebooker truebooker to 1.2.7 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

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Executive Summary

The TrueBooker WordPress plugin before version 1.2.7 has a vulnerability where an AJAX action lacks proper authorization checks. This allows unauthenticated users to change the status of any appointment and trigger notification emails to affected customers.

Detection Guidance

Check the installed version of the TrueBooker plugin in WordPress. If it is below 1.2.7, the system is vulnerable. Look for unauthorized changes in appointment statuses or unexpected notification emails sent to customers.

Impact Analysis

An attacker could manipulate appointment statuses, causing confusion or disruption for both the business and customers. They could also send unauthorized notifications, potentially leading to phishing or misinformation risks.

Compliance Impact

This vulnerability may violate data integrity and confidentiality principles in GDPR and HIPAA. Unauthorized changes to appointment data could lead to compliance breaches, especially if customer notifications are manipulated.

Mitigation Strategies

Update the TrueBooker plugin to version 1.2.7 or later immediately. If updating is not possible, consider disabling the plugin until an update is applied.

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