# CVE-2025-12166: Simply Schedule Appointments <= 1.6.9.9 - Unauthenticated SQL Injection via `order` and `append_where_sql` Parameters

> Unauthenticated attackers can exploit blind SQL injection to extract sensitive database information from the Simply Schedule Appointments WordPress plugin.

- **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:** 14 Jan 2026
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-rv9m-9xwv-6gcw

## What is CVE-2025-12166?

CVE-2025-12166 is a high-severity SQL injection vulnerability in croixhaug Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin, published on 14 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to blind SQL Injection via the `order` and `append_where_sql` parameters in all versions up to, and including, 1.6.9.9 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query.  This makes it possible for unauthenticated attackers to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database.

Weakness: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command)

## Which versions are affected by CVE-2025-12166?


## How do I fix CVE-2025-12166?

No fix has been published for CVE-2025-12166 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-12166 being exploited?

There is no known exploitation of CVE-2025-12166 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-12166 and fix it if it is affected.

What it is: CVE-2025-12166 is a high-severity SQL injection vulnerability in croixhaug Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin, published on 14 Jan 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-2025-12166 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-2025-12166/ (Markdown: https://insights.sbomify.com/CVE-2025-12166/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-12166
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-12166
- OSV: https://osv.dev/vulnerability/CVE-2025-12166

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-12166/
Summaries are generated and may contain mistakes; the official description above is the record.