# 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.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Sep 2026
- **Updated:** 2 Sep 2026
- **Also known as:** GHSA-9h4g-7958-x29w

## 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 (Improper Privilege Management)

## 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:

- https://github.com/EXEcution-py/CVE-2026-9055 (github_poc): https://github.com/EXEcution-py/CVE-2026-9055

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-9055 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-9055 in the wild and no public exploit code.

Affected product: melograno Booking for Appointments and Events Calendar – Amelia. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-9055/ (Markdown: https://insights.sbomify.com/CVE-2026-9055/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-9055
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-9055
- OSV: https://osv.dev/vulnerability/CVE-2026-9055

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-9055/
Summaries are generated and may contain mistakes; the official description above is the record.