High severity · published Apr 7, 2026
CVE-2026-5465
Amelia <= 2.1.3 - Insecure Direct Object Reference to Authenticated (Employee+) Privilege Escalation via 'externalId' Parameter
8.8
CVSS
0.6%
EPSS
No
On KEV
Description
The Booking for Appointments and Events Calendar – Amelia plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 2.1.3. This is due to the `UpdateProviderCommandHandler` failing to validate changes to the `externalId` field when a Provider (Employee) user updates their own profile. The `externalId` maps directly to a WordPress user ID and is passed to `wp_set_password()` and `wp_update_user()` without authorization checks. This makes it possible for authenticated attackers, with Provider-level (Employee) access and above, to take over any WordPress account — including Administrator — by injecting an arbitrary `externalId` value when updating their own provider profile.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 50% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BF
Booking for Appointments and Events Calendar – Amelia · ameliabooking
through 2.1.3 · source: vendor
Affected product
BF
Booking for Appointments and Events Calendar – Amelia
ameliabooking
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-5465
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-5465
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/ameliabooking/tags/2.1.3/src/Application/Commands/User/Provider/UpdateProviderCommandHandler.php#L146
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/ameliabooking/tags/2.1.3/src/Application/Commands/User/Provider/UpdateProviderCommandHandler.php#L219
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/ameliabooking/tags/2.1.3/src/Application/Commands/User/Provider/UpdateProviderCommandHandler.php#L239
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/ameliabooking/tags/2.1.3/src/Application/Controller/User/Provider/UpdateProviderController.php#L30
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/changeset/3499608/ameliabooking/trunk/src/Application/Commands/User/Provider/UpdateProviderCommandHandler.php
www.wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/a4204099-1065-4167-8b42-3da25945236c?source=cve
More from Booking for Appointments and Events Calendar – Amelia
8.8
CVE-2026-2931
Amelia Booking <= 9.1.2 - Authenticated (Customer+) Insecure Direct Object Reference to Arbitrary User Password Change
7.5
CVE-2025-12482
Booking for Appointments and Events Calendar – Amelia <= 1.2.35 - Unauthenticated SQL Injection via search
6.5
CVE-2026-4668
Amelia <= 2.1.2 - Authenticated (Manager+) SQL Injection via 'sort' Parameter
6.5
CVE-2024-6332
Booking for Appointments and Events Calendar – Amelia Premium <= 7.7 and Lite <= 1.2.4 - Missing Authorization to Sensitive Information Exposure
6.1
CVE-2024-1484
Booking for Appointments and Events Calendar – Amelia <= 1.0.98 - Reflected Cross-Site Scripting