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CVE-2026-109369— WP Booking System <= 2.1.0.3 - Missing Authorization to Authenticated (Subscriber+) Privilege Escalation via 'user_permission' Parameter via Cross-Form Nonce Reuse

Quick assessment

Affected
murgroland WP Booking System – Booking Calendar
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 的"WP Booking System – Booking Calendar"插件在所有 2.1.0.3 及更早版本中存在授权绕过漏洞。该漏洞源于插件未能正确验证用户是否具备执行特定操作的权限。因此，拥有“订阅者”级别及以上权限的已认证攻击者，可以通过覆盖控制插件自身访问控制列表的 元数据，为自己及任意其他用户授予对站点上所有预订表单的编辑权限。 利用该漏洞需要攻击者事先已在至少一个预订表单上被授予编辑权限；因为该权限委托操作会将子菜单能力降级为"read"（从而使编辑页面可访问），并允许攻击者

CVSS 6.8 · Medium
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I. Basic Information for CVE-2026-109369

Vulnerability Information
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Vulnerability Title
WP Booking System <= 2.1.0.3 - Missing Authorization to Authenticated (Subscriber+) Privilege Escalation via 'user_permission' Parameter via Cross-Form Nonce Reuse
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
murgroland WP Booking System – Booking Calendar 0 ~ 2.1.0.3 -

II. Public POCs for CVE-2026-109369

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III. Intelligence Information for CVE-2026-109369

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Patches & Fixes for CVE-2026-109369 (1)

Proof of Concept for CVE-2026-109369 (1)

Vendor Pages for CVE-2026-109369 (2)

Other References for CVE-2026-109369 (1)

Same Patch Batch · murgroland · 2026-10-17 · 3 CVEs total

CVE-2026-108123 7.5 HIGH WP Booking System <= 2.1.0.3 - Missing Authorization to Unauthenticated Sensitive Informat
CVE-2026-109368 6.5 MEDIUM WP Booking System <= 2.1.0.3 - Missing Authorization to Authenticated (Subscriber+) Sensit

IV. Related Vulnerabilities

Same product: WP Booking System – Booking Calendar
Same vendor: murgroland
Same weakness: CWE-862

V. Comments for CVE-2026-109369

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