# CVE-2026-89063: Missing authorization in Online Scheduling and Appointment Booking System – Bookly

> Unauthenticated attackers can read and inject messages into any customer's AI booking conversation due to missing authorization checks on the conversation ID.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Sep 2026
- **Updated:** 17 Sep 2026
- **Also known as:** GHSA-f895-wc4g-97xv

## What is CVE-2026-89063?

CVE-2026-89063 is a high-severity missing authorization vulnerability in ladela Online Scheduling and Appointment Booking System – Bookly, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Online Scheduling and Appointment Booking System – Bookly plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 28.1 via the 'conversation_id' parameter due to missing validation on a user controlled key. This makes it possible for unauthenticated attackers to read the full AI booking conversation transcript of any customer — leaking names, email addresses, phone numbers, and appointment details echoed by the assistant — and inject arbitrary messages into any victim conversation that are subsequently replayed to the Cloud AI worker along with the full private history. Because AI conversations are stored with no owner, user, or session identifier and conversation IDs are sequential integers, an unauthenticated attacker can enumerate all customer conversations simply by incrementing the conversation_id parameter.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-89063?


## How do I fix CVE-2026-89063?

No fix has been published for CVE-2026-89063 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-89063 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-89063 exists.

Public exploit code:

- Bookly <=28.1 - IDOR Unauthenticated Sensitive Data Access (nuclei): http/cves/2026/CVE-2026-89063.yaml

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-89063 and fix it if it is affected.

What it is: CVE-2026-89063 is a high-severity missing authorization vulnerability in ladela Online Scheduling and Appointment Booking System – Bookly, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-89063 exists.

Affected product: ladela Online Scheduling and Appointment Booking System – Bookly. 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-2026-89063/ (Markdown: https://insights.sbomify.com/CVE-2026-89063/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-89063
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-89063
- OSV: https://osv.dev/vulnerability/CVE-2026-89063

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-89063/
Summaries are generated and may contain mistakes; the official description above is the record.