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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 的“预约与活动日历 – Amelia（Premium）”插件在 8.0 至 9.6.2 版本中存在权限提升漏洞。该漏洞源于客户更新端点中对攻击者可控的 'type' 参数缺乏充分校验。攻击者可以利用该缺陷，将自身角色设置为 'manager'，并在 'externalId' 参数设为 0 时，触发系统创建一个具有 'wpamelia-manager' 角色的 WordPress 用户。这使得未认证的攻击者能够首先将权限提升至管理员级别：先将自身角色提升为经理，随后创建一个关联到某个管理员用户 I

CVSS 9.8 · Critical
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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

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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