themetechmount TrueBooker Plugin up to 1.2.6 on WordPress AJAX admin_user_create_cus truebooker_wp_user_id authorization

Summaryinfo

A vulnerability categorized as critical has been discovered in themetechmount TrueBooker Plugin up to 1.2.6. This affects the function admin_user_create_cus of the component AJAX Handler. Such manipulation of the argument truebooker_wp_user_id leads to authorization. This vulnerability is documented as CVE-2026-18315. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in themetechmount TrueBooker Plugin up to 1.2.6 and classified as critical. Affected by this issue is the function admin_user_create_cus of the component AJAX Handler. The manipulation of the argument truebooker_wp_user_id with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at wordfence.com. This vulnerability is handled as CVE-2026-18315 since 07/29/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/19/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• WordPress Plugin

Vendor

• themetechmount

Name

• TrueBooker Plugin

Version

• 1.2.0
• 1.2.1
• 1.2.2
• 1.2.3
• 1.2.4
• 1.2.5
• 1.2.6

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CPE 2.2info

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