wpdevelop Booking Calendar Plugin up to 11.8.2 on WordPress AJAX Action admin-ajax.php handle_ajax_save data_name privileges management

Summaryinfo

A vulnerability was found in wpdevelop Booking Calendar Plugin up to 11.8.2 and classified as critical. This affects the function handle_ajax_save of the file admin-ajax.php of the component AJAX Action. The manipulation of the argument data_name results in privileges management. This vulnerability is identified as CVE-2026-92619. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as critical has been found in wpdevelop Booking Calendar Plugin up to 11.8.2. Affected is the function handle_ajax_save of the file admin-ajax.php of the component AJAX Action. The manipulation of the argument data_name with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

The Booking Calendar plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 11.8.2 via the `wpbc_ajax_option_save` AJAX action. The vulnerability exists because the `handle_ajax_save()` function applies per-option safeguards only to names explicitly registered via `register_option_policy()`, causing `get_option_policy()` to return an empty policy — bypassing all can_save, force_mode, and allowed_keys checks — for any unregistered option name, including core WordPress options, while an attacker-controlled `data_name` parameter passes through `sanitize_key()` and is written directly to `update_option()` without restriction. This makes it possible for authenticated attackers with Editor-level access and above to escalate their privileges to Administrator by writing core WordPress options such as `default_role=administrator` and `users_can_register=1`, then self-registering a new Administrator account. The nonce check does not meaningfully restrict this attack, as both the nonce value and nonce action are attacker-supplied POST parameters, and a valid nonce is trivially obtainable via `admin-ajax.php?action=rest-nonce`.

The advisory is shared for download at wordfence.com. This vulnerability is traded as CVE-2026-92619 since 09/16/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. 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 09/18/2026). The MITRE ATT&CK project declares the attack technique as T1068.

By approaching the search of inurl:admin-ajax.php it is possible to find vulnerable targets with Google Hacking.

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

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• WordPress Plugin

Vendor

• wpdevelop

Name

• Booking Calendar Plugin

Version

• 11.8.0
• 11.8.1
• 11.8.2

CPE 2.3info

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CPE 2.2info

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