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CVE-2026-9055— Booking for Appointments and Events Calendar – Amelia (Premium) 8.0 - 9.6.2 - Unauthenticated Privilege Escalation to Administrator via 'externalId'

Quick assessment

Affected
melograno Booking for Appointments and Events Calendar – Amelia
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 Amelia是WordPress基金会的一个预约与活动预订插件。 WordPress Amelia 8.0版本至9.6.2版本存在权限许可和访问控制问题漏洞，该漏洞源于对客户更新端点中攻击者可控的'type'参数验证不足，当'externalId'参数设置为0时可能创建wpamelia-manager角色的用户，导致未经身份验证的攻击者将权限提升至管理员。

CVSS 9.8 · Critical EPSS 0.51% · P42

Affected Version Matrix 1

VendorProduct Version RangeStatus
melograno Booking for Appointments and Events Calendar – Amelia 8.0≤ 9.6.2 affected
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I. Basic Information for CVE-2026-9055

Vulnerability Information
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Vulnerability Title
Booking for Appointments and Events Calendar – Amelia (Premium) 8.0 - 9.6.2 - Unauthenticated Privilege Escalation to Administrator via 'externalId'
Source: CVE Program / CVE List V5
Vulnerability Description
The Booking for Appointments and Events Calendar – Amelia (Premium) plugin for WordPress is vulnerable to Privilege Escalation in versions 8.0 - 9.6.2. This is due to insufficient validation of the attacker-controlled 'type' parameter in the customer update endpoint, which allows customers to set their role to 'manager' and trigger creation of a WordPress user with the wpamelia-manager role when the 'externalId' parameter is set to 0. This makes it possible for unauthenticated attackers to escalate their privileges to administrator by first elevating to the manager role, then creating a provider entity linked to an administrator user ID and overwriting that administrator's password.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress Amelia 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Amelia是WordPress基金会的一个预约与活动预订插件。 WordPress Amelia 8.0版本至9.6.2版本存在权限许可和访问控制问题漏洞，该漏洞源于对客户更新端点中攻击者可控的'type'参数验证不足，当'externalId'参数设置为0时可能创建wpamelia-manager角色的用户，导致未经身份验证的攻击者将权限提升至管理员。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
melograno Booking for Appointments and Events Calendar – Amelia 8.0 ~ 9.6.2 -

II. Public POCs for CVE-2026-9055

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III. Intelligence Information for CVE-2026-9055

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Security Blog Posts for CVE-2026-9055 (1)

Vendor Pages for CVE-2026-9055 (1)

IV. Related Vulnerabilities

Same product: Booking for Appointments and Events Calendar – Amelia
Same vendor: melograno
Same weakness: CWE-269

V. Comments for CVE-2026-9055

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