Privilege Escalation Vulnerability in Booking for Appointments and Events Calendar Plugin by Amelia
CVE-2026-9055

9.8CRITICAL

Key Information:

Vendor

WordPress
Status
Booking For Appointments And Events Calendar – Amelia
Vendor
CVE Published:
2 September 2026

What is CVE-2026-9055?

The Booking for Appointments and Events Calendar – Amelia (Premium) plugin for WordPress has a significant vulnerability that allows unauthorized users to exploit insufficient validation of the 'type' parameter within the customer update endpoint. This flaw enables attackers to effectively elevate their user role to 'manager' and create a new WordPress user with elevated privileges. By manipulating the 'externalId' parameter, attackers can leverage this vulnerability to gain administrator access, which poses a severe risk to website integrity and security.

Affected Version(s)

Booking for Appointments and Events Calendar – Amelia 8.0 <= 9.6.2

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://wpamelia.com/documentation/changelog/

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

d.v4n_s3c
.