Is CVE-2026-116557 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-116557 being exploited in the wild.

How severe is CVE-2026-116557?

Critical severity, with a CVSS score of 9.1, published 31 October 2026.

Which products and versions are affected?

WP Booking System – Booking Calendar up to and including 2.1.0.5.

Is there a fix for CVE-2026-116557?

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-2026-116557 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-116557?

Check whether you run WP Booking System – Booking Calendar at an affected version. 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.

CVE-2026-116557: WP Booking System Booking Calendar authorization bypass in note deletion

CVE-2026-116557 · Severity: critical · CVSS 9.1 · Published 2026-10-31

The WP Booking System - Booking Calendar plugin for WordPress allows low-privilege users (Subscribers and above) to delete calendar notes without proper permission checks. An attacker with minimal WordPress account access can remove any calendar notes created by other users, disrupting booking operations and data integrity.

Technologies: WP Booking System – Booking Calendar. Vendors: WP Booking System.

Quick answers

Is CVE-2026-116557 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-116557 being exploited in the wild.
How severe is CVE-2026-116557?: Critical severity, with a CVSS score of 9.1, published 31 October 2026.
Which products and versions are affected?: WP Booking System – Booking Calendar up to and including 2.1.0.5.
Is there a fix for CVE-2026-116557?: 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-2026-116557 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-116557?: Check whether you run WP Booking System – Booking Calendar at an affected version. 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 wpbs_action_ajax_calendar_remove_note() function lacks capability checks, allowing authenticated users with Subscriber-level permissions to delete arbitrary calendar notes via AJAX. The vulnerability requires authentication but no additional preconditions; attackers can target notes across any calendar in the system. A fix in versions after 2.1.0.5 restricts this functionality.

Affected products

WP Booking System WP Booking System - Booking Calendar up to and including 2.1.0.5

Timeline

2026-10-31: disclosed

References

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