CVE-2026-9055 Privilege escalation in Booking for Appointments and Events Calendar – Amelia
Unauthenticated attackers can escalate privileges to administrator by manipulating customer update parameters to overwrite admin passwords.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-9055?
CVE-2026-9055 is a critical vulnerability in melograno Booking for Appointments and Events Calendar – Amelia, published on 2 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-269
Which versions are affected by CVE-2026-9055?
How do I fix CVE-2026-9055?
No fix has been published for CVE-2026-9055 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-9055 being exploited?
There is no known exploitation of CVE-2026-9055 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-9h4g-7958-x29w.