Bookly Plugin up to 28.2 on WordPress AJAX Actions order_id resource injection

Summaryinfo

A vulnerability labeled as critical has been found in Bookly Plugin up to 28.2. This affects the function bookly_get_form_id/bookly_render_complete/bookly_add_to_calendar/bookly_rollback_order of the component AJAX Actions. Executing a manipulation of the argument order_id can lead to resource injection. This vulnerability is handled as CVE-2026-93399. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability has been found in Bookly Plugin up to 28.2 and classified as critical. This vulnerability affects the function bookly_get_form_id/bookly_render_complete/bookly_add_to_calendar/bookly_rollback_order of the component AJAX Actions. The manipulation of the argument order_id with an unknown input leads to a resource injection vulnerability. The CWE definition for the vulnerability is CWE-99. The product receives input from an upstream component, but it does not restrict or incorrectly restricts the input before it is used as an identifier for a resource that may be outside the intended sphere of control. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The Bookly plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions up to, and including, 28.2 via the 'bookly_get_form_id', 'bookly_render_complete', 'bookly_add_to_calendar' and 'bookly_rollback_order' AJAX actions. This is due to the 'bookly_get_form_id' handler blindly storing the attacker-controlled 'order_id' from the submitted form_data into a new booking session, which the 'bookly_render_complete' handler then trusts to look up and return the corresponding Order's secret token without verifying that the current session created that order. This makes it possible for unauthenticated attackers to enumerate sequential order IDs, disclose other customers' order tokens, retrieve calendar/appointment information via 'bookly_add_to_calendar' and permanently delete arbitrary non-completed bookings via 'bookly_rollback_order', which cascade-deletes the customer_appointment and (when no other customers are attached) the underlying appointment.

The advisory is available at wordfence.com. This vulnerability was named CVE-2026-93399 since 09/17/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/25/2026).

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

Name

• Bookly Plugin

Version

• 28.0
• 28.1
• 28.2

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CPE 2.2info

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