What’s Vulnerable › Vulnerabilities

CVE-2026-17538: Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress <= 5.6.9 - Authenticated (Subscriber+) Insecure Direct Object Reference to Arbitrary Customer PII Modification

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-08 · updated 2026-10-10
• Weakness: CWE-639

Description

The LatePoint - Appointment Booking & Reservation plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions up to, and including, 5.6.9. This is due to the process_step_customer() function using is_user_logged_in() as the sole gate before merging POSTed customer data into an existing LatePoint customer, without any ownership checks. This makes it possible for authenticated attackers, with Subscriber-level access and above, to modify the personal information (first name, last name, email, phone, notes) of arbitrary LatePoint customers, and, when the contact_merge setting is 'phone', to overwrite the victim's email address and take over the account via a password reset.

Affected products

• latepoint Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress: through 5.6.9

References

• https://plugins.trac.wordpress.org/changeset/3631493/
• https://www.wordfence.com/threat-intel/vulnerabilities/id/83cdc51f-b5e1-42b9-972a-7e781f97b43e?source=cve

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