# CVE-2026-92619: Booking Calendar privilege escalation via unregistered options

Source: https://junglewise.ai/threats/cve-2026-92619-booking-calendar-privilege-escalation-via-unregistered-options  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-18. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-92619 · Severity: high · CVSS 7.2 · Published 2026-09-18

The Booking Calendar plugin for WordPress allows authenticated users with Editor-level permissions to escalate their account privileges to Administrator. An attacker can exploit a flaw in the plugin's option-saving mechanism to modify core WordPress settings, create a new Administrator account, and gain full control of the website. This puts customer data, site functionality, and business reputation at severe risk.

## Quick answers

**Is CVE-2026-92619 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-92619 being exploited in the wild.

**How severe is CVE-2026-92619?** High severity, with a CVSS score of 7.2, published 18 September 2026.

**Which products and versions are affected?** Team Booking Booking Calendar up to 11.8.2.

**Is there a fix for CVE-2026-92619?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-92619 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-92619?** Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a privilege escalation flaw in the `handle_ajax_save()` function of the Booking Calendar plugin. The function fails to validate access controls for unregistered WordPress options, bypassing all `can_save`, `force_mode`, and `allowed_keys` checks when an attacker supplies an unregistered option name via the `wpbc_ajax_option_save` AJAX action. An authenticated attacker with Editor-level access or above can exploit this to modify core WordPress options such as `default_role` and `users_can_register`, then self-register a new Administrator account. Although a nonce check exists, it is ineffective because both the nonce value and action are attacker-controlled POST parameters, and a valid nonce can be trivially obtained via the `admin-ajax.php?action=rest-nonce` endpoint. The vulnerability affects all versions up to and including 11.8.2.

## Affected products

- Team Booking Booking Calendar up to 11.8.2

## Timeline

- 2026-09-18: disclosed

## References

- [https://plugins.trac.wordpress.org/browser/booking/tags/11.8.2/includes/page-form-builder/ajax/bfb-ajax.php](https://plugins.trac.wordpress.org/browser/booking/tags/11.8.2/includes/page-form-builder/ajax/bfb-ajax.php)
- [https://plugins.trac.wordpress.org/browser/booking/tags/11.8.2/includes/save-load-option/save-load-option.php](https://plugins.trac.wordpress.org/browser/booking/tags/11.8.2/includes/save-load-option/save-load-option.php)