Authorization bypass in ameliabooking Booking for Appointments and Events Calendar…
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-639.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| ameliabooking | Booking for Appointments and Events Calendar – Amelia | up to 2.1.3 | — | No fix listed | CNA |
- Booking for Appointments and Events Calendar – Amelia Vendorameliabooking Affected up to 2.1.3 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-5465
- 2026-10-03 Alias added: GHSA-3wcx-px3j-79f4
- 2026-10-27 EPSS moved to the 50th–90th percentile
References
Other 6
- https://www.wordfence.com/threat-intel/vulnerabilities/id/a4204099-1065-4167-8b42-3da25945236c?source=cve
- https://plugins.trac.wordpress.org/browser/ameliabooking/tags/2.1.3/src/Application/Controller/User/Provider/UpdateProviderController.php#L30
- https://plugins.trac.wordpress.org/browser/ameliabooking/tags/2.1.3/src/Application/Commands/User/Provider/UpdateProviderCommandHandler.php#L146
- https://plugins.trac.wordpress.org/browser/ameliabooking/tags/2.1.3/src/Application/Commands/User/Provider/UpdateProviderCommandHandler.php#L219
- https://plugins.trac.wordpress.org/browser/ameliabooking/tags/2.1.3/src/Application/Commands/User/Provider/UpdateProviderCommandHandler.php#L239
- https://plugins.trac.wordpress.org/changeset/3499608/ameliabooking/trunk/src/Application/Commands/User/Provider/UpdateProviderCommandHandler.php
More ameliabooking vulnerabilities
- TI-2026-02524 Amelia Booking <= 9.1.2 - Authenticated (Customer+) Insecure Direct Object Reference to Arbitrary User Password Change CVSS 3.1HIGH 8.8
- TI-2025-11453 Booking for Appointments and Events Calendar – Amelia <= 1.2.35 - Unauthenticated SQL Injection via search CVSS 3.1HIGH 7.5
- TI-2026-20148 WordPress Amelia plugin <= 1.2.38 - Privilege Escalation vulnerability CVSS 3.1HIGH 7.2
- TI-2026-28461 WordPress Amelia plugin <= 2.1.1 - SQL Injection vulnerability CVSS 3.1HIGH 7.6
- TI-2026-20152 WordPress Amelia plugin <= 1.2.38 - Broken Access Control vulnerability CVSS 3.1MEDIUM 5.3
- TI-2026-05657 Improper authorization in ameliabooking Booking for Appointments and Events Calendar… CVSS 3.1MEDIUM 5.3
Sources
- CVE-2026-5465 · CVE Program
- CVE-2026-5465 · NVD
- FIRST EPSS
- GHSA-3wcx-px3j-79f4 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences