LatePoint Appointment Booking Plugin – LatePoint Plugin up to 5.7.2 on WordPress OsCustomerHelper create_wp_user_for_customer customer/email improper authentication

Summaryinfo

A vulnerability, which was classified as critical, has been found in LatePoint Appointment Booking Plugin – LatePoint Plugin up to 5.7.2. Affected by this vulnerability is the function OsCustomerHelper::create_wp_user_for_customer of the component OsCustomerHelper. The manipulation of the argument customer/email leads to improper authentication. This vulnerability is documented as CVE-2026-100163. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in LatePoint Appointment Booking Plugin – LatePoint Plugin up to 5.7.2 and classified as critical. This issue affects the function OsCustomerHelper::create_wp_user_for_customer of the component OsCustomerHelper. The manipulation of the argument customer/email with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

The Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress plugin for WordPress is vulnerable to Authentication Bypass in versions up to, and including, 5.7.2 via the OsCustomerHelper::create_wp_user_for_customer() helper reached from the public process_step_customer() booking step. When the 'Use WordPress users as customers' option is enabled, the helper falls back from email_exists() to username_exists( $customer->email ), which matches any WordPress user whose user_login equals the victim customer's email even when that user's user_email is completely different, and links that WordPress user's ID into the victim's LatePoint customer row (only privileged roles are excluded; Subscriber is allowed). This makes it possible for authenticated attackers, with Subscriber-level access and above, to take over another customer's LatePoint account — accessing their bookings, service, agent, and calendar data, and having the victim customer's email overwritten with the attacker's on next login — by holding a Subscriber account whose user_login equals the victim's email and submitting an unauthenticated public booking step registration request.

The advisory is shared at wordfence.com. The identification of this vulnerability is CVE-2026-100163 since 09/25/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/14/2026).

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

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• LatePoint

Name

• Appointment Booking Plugin – LatePoint Plugin

Version

• 5.7.0
• 5.7.1
• 5.7.2

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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