ladela Online Scheduling and Appointment Booking System Plugin Ajax Controller postValidateCustomer authorization

Summaryinfo

A vulnerability categorized as problematic has been discovered in ladela Online Scheduling and Appointment Booking System Plugin up to 28.2. The affected element is the function postValidateCustomer of the component Ajax Controller. Such manipulation of the argument verification_code leads to authorization. This vulnerability is traded as CVE-2026-92799. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in ladela Online Scheduling and Appointment Booking System Plugin up to 28.2. Affected by this issue is the function postValidateCustomer of the component Ajax Controller. The manipulation of the argument verification_code 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 integrity. CVE summarizes:

The Online Scheduling and Appointment Booking System – Bookly plugin for WordPress is vulnerable to Authorization Bypass via PHP Type Juggling in all versions up to, and including, 28.2. This is due to the `postValidateCustomer()` function using a loose PHP inequality operator (`!=`) to compare the session-stored one-time verification code against the attacker-supplied `verification_code` parameter — a flaw that is further exposed by the booking AJAX controller registering all its methods as `wp_ajax_nopriv_` handlers and unconditionally overriding `csrfTokenValid()` to return true, leaving the endpoint both unauthenticated and CSRF-unprotected. This makes it possible for unauthenticated attackers to bypass the phone/email ownership verification step and overwrite the name, email, phone, and address fields of any arbitrary existing Bookly customer record, redirecting that customer's booking notifications to attacker-controlled contact details. The bypass is achievable because the `json_data` input channel decodes input via `json_decode()`, which preserves real PHP types and causes the `wp_kses` filter to leave non-string values such as the JSON boolean `true` untouched; submitting `true` as the `verification_code` satisfies the loose comparison against the session's non-zero integer code (generated by `mt_rand(100000, 999999)`), causing `true != <non-zero int>` to evaluate as `false` and the guard to be bypassed.

The advisory is shared for download at wordfence.com. This vulnerability is handled as CVE-2026-92799 since 09/16/2026. 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 09/25/2026).

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

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• ladela

Name

• Online Scheduling and Appointment Booking System Plugin

Version

• 28.0
• 28.1
• 28.2

CPE 2.3info

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• 🔒
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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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