Is CVE-2026-9055 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-9055 being exploited in the wild.

How severe is CVE-2026-9055?

Critical severity, with a CVSS score of 9.8, published 2 September 2026.

Which products and versions are affected?

TMS Amelia Premium 8.0 through 9.6.2.

Is there a fix for CVE-2026-9055?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-9055 attacked?

It is attacked over the network.

Am I affected by CVE-2026-9055?

Check whether you run TMS Amelia Premium at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-9055: WordPress Amelia Premium privilege escalation in customer update endpoint

CVE-2026-9055 · Severity: critical · CVSS 9.8 · Published 2026-09-02

The Amelia Premium WordPress plugin for booking appointments and events contains a privilege escalation vulnerability that allows unauthenticated attackers to gain full administrator access to a WordPress site. By manipulating API parameters, an attacker can first elevate their own account to manager status, then overwrite administrator credentials, resulting in complete site takeover and potential exposure of all customer booking data and site functionality.

Vendors: TMS.

Quick answers

Is CVE-2026-9055 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-9055 being exploited in the wild.
How severe is CVE-2026-9055?: Critical severity, with a CVSS score of 9.8, published 2 September 2026.
Which products and versions are affected?: TMS Amelia Premium 8.0 through 9.6.2.
Is there a fix for CVE-2026-9055?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-9055 attacked?: It is attacked over the network.
Am I affected by CVE-2026-9055?: Check whether you run TMS Amelia Premium at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is a privilege escalation resulting from insufficient validation of the 'type' parameter in the customer update API endpoint. Unauthenticated attackers can exploit this by setting their role to 'manager' with the 'externalId' parameter set to 0, triggering creation of a WordPress user with the wpamelia-manager role. From this elevated manager position, an attacker can then create a provider entity linked to an administrator user ID and overwrite that administrator's password, achieving full administrator privileges. The vulnerability affects versions 8.0 through 9.6.2 and requires no authentication or user interaction to exploit.

Affected products

TMS Amelia Premium 8.0 through 9.6.2

Timeline

2026-09-02: disclosed

References

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