# CVE-2026-104898: Privilege escalation in Online Scheduling and Appointment Booking System – Bookly

> Authenticated subscribers can escalate privileges by hijacking admin staff account bindings via insecure direct object reference in the Bookly plugin.

- **Severity:** Medium 6.8 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Oct 2026
- **Updated:** 11 Oct 2026
- **Also known as:** GHSA-688p-jfpg-cv62

## What is CVE-2026-104898?

CVE-2026-104898 is a medium-severity vulnerability in ladela Online Scheduling and Appointment Booking System – Bookly, published on 10 Oct 2026. Any signed-in user can exploit it over the network, 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, 28.4 via the 'id, wp_user_id' parameter due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with subscriber-level access and above, to overwrite the WordPress account binding of any Bookly staff record, including those owned by administrators, effectively hijacking a higher-privileged staff member's account association and escalating privileges. Exploitation requires the attacking user to be linked to at least one Bookly staff record, which occurs by default whenever an admin enables the bookly_gen_allow_staff_edit_profile option (active on fresh installs) and links a WordPress user to a staff entry.

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

## Which versions are affected by CVE-2026-104898?


## How do I fix CVE-2026-104898?

No fix has been published for CVE-2026-104898 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-104898 being exploited?

There is no known exploitation of CVE-2026-104898 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-104898 and fix it if it is affected.

What it is: CVE-2026-104898 is a medium-severity vulnerability in ladela Online Scheduling and Appointment Booking System – Bookly, published on 10 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-104898 in the wild and no public exploit code.

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-2026-104898/ (Markdown: https://insights.sbomify.com/CVE-2026-104898/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-104898
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-104898
- OSV: https://osv.dev/vulnerability/CVE-2026-104898

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-104898/
Summaries are generated and may contain mistakes; the official description above is the record.