# CVE-2026-1708: Appointment Booking Calendar <= 1.6.9.27 - Unauthenticated SQL Injection via 'append_where_sql' Parameter

> Unauthenticated attackers can extract sensitive database information via SQL injection in the Appointment Booking Calendar 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:** 11 Mar 2026
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-g769-gg5q-p2w7

## What is CVE-2026-1708?

CVE-2026-1708 is a high-severity SQL injection vulnerability in croixhaug Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin, published on 11 Mar 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 in all versions up to, and including, 1.6.9.27. This is due to the `db_where_conditions` method in the `TD_DB_Model` class failing to prevent the `append_where_sql` parameter from being passed through JSON request bodies, while only checking for its presence in the `$_REQUEST` superglobal. This makes it possible for unauthenticated attackers to append arbitrary SQL commands to queries and extract sensitive information from the database via the `append_where_sql` parameter in JSON payloads granted they have obtained a valid `public_token` that is inadvertently exposed during the booking flow.

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

## Which versions are affected by CVE-2026-1708?


## How do I fix CVE-2026-1708?

No fix has been published for CVE-2026-1708 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-1708 being exploited?

There is no known exploitation of CVE-2026-1708 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-1708 and fix it if it is affected.

What it is: CVE-2026-1708 is a high-severity SQL injection vulnerability in croixhaug Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin, published on 11 Mar 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-2026-1708 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-2026-1708/ (Markdown: https://insights.sbomify.com/CVE-2026-1708/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-1708
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-1708
- OSV: https://osv.dev/vulnerability/CVE-2026-1708

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-1708/
Summaries are generated and may contain mistakes; the official description above is the record.