# CVE-2026-1704: Missing authorization in Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin

> Authenticated staff users can view other staff members' appointment records and sensitive customer PII due to missing ownership validation.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/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:** 13 Mar 2026
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-fq3v-mc83-wvwc

## What is CVE-2026-1704?

CVE-2026-1704 is a medium-severity missing authorization vulnerability in croixhaug Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin, published on 13 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 1.6.9.29. This is due to the `get_item_permissions_check` method granting access to users with the `ssa_manage_appointments` capability without validating staff ownership of the requested appointment. This makes it possible for authenticated attackers, with custom-level access and above (users granted the ssa_manage_appointments capability, such as Team Members), to view appointment records belonging to other staff members and access sensitive customer personally identifiable information via the appointment ID parameter.

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

## Which versions are affected by CVE-2026-1704?


## How do I fix CVE-2026-1704?

No fix has been published for CVE-2026-1704 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-1704 being exploited?

There is no known exploitation of CVE-2026-1704 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-1704 and fix it if it is affected.

What it is: CVE-2026-1704 is a medium-severity missing authorization vulnerability in croixhaug Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin, published on 13 Mar 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-2026-1704 in the wild and no public exploit code.

Affected product: croixhaug Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin. 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-2026-1704/ (Markdown: https://insights.sbomify.com/CVE-2026-1704/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-1704
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-1704
- OSV: https://osv.dev/vulnerability/CVE-2026-1704

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-1704/
Summaries are generated and may contain mistakes; the official description above is the record.