CVE-2026-109369WP Booking System <= 2.1.0.3 - Missing Authorization to Authenticated (Subscriber+) Privilege Escalation via 'user_permission' Parameter via Cross-Form Nonce Reuse
Updated under an hour ago ()
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It affects murgroland WP Booking System – Booking Calendar. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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The WP Booking System – Booking Calendar plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 2.1.0.3 This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with subscriber-level access and above, to grant themselves and arbitrary other users edit access to every booking form on the site by overwriting the user_permission meta that governs the plugin's own access-control list. Exploitation requires the attacker to have already been delegated edit rights on at least one booking form, as this delegation both downgrades the submenu capability to 'read' (making the edit page accessible) and allows them to harvest a valid wpbs_edit_form nonce that will pass validation against any other form_id.
- CVSS
- 6.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-862
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Wordfence
- NVD analysis
- Received
- Record last updated
- Oct 18, 2026
- First seen by InfoSec Signals
- Oct 17, 2026
Affected products
murgroland WP Booking System – Booking Calendar murgroland:wp_booking_system_booking_calendar (from the name) | through 2.1.0.3 | CNA record |
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/6d795763-1c26-4ad8-b4b5-d9c051f064fb?source=cve
- https://plugins.trac.wordpress.org/browser/wp-booking-system/tags/2.1.0.2/includes/modules/user-restrictions/functions-restrictions-form.php#L56
- https://plugins.trac.wordpress.org/browser/wp-booking-system/tags/2.1.0.2/includes/base/admin/form/functions-actions-form.php#L97
- https://plugins.trac.wordpress.org/browser/wp-booking-system/tags/2.1.0.2/includes/base/admin/functions.php#L30
- https://plugins.trac.wordpress.org/changeset?old=3730163&old_path=%2Fwp-booking-system%2Ftrunk&new=&new_path=%2Fwp-booking-system%2Ftrunk
- https://plugins.trac.wordpress.org/changeset/3750120/wp-booking-system/trunk/includes/modules/user-restrictions/functions-restrictions-form.php
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.