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.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
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
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.
Use parameterised queries everywhere and never build SQL by joining strings. Upgrade affected software first; a web application firewall only buys time. More about SQL injection.
Is CVE-2026-1708 being exploited?
There is no known exploitation of CVE-2026-1708 in the wild and no public exploit code.
Sources
Also known as GHSA-g769-gg5q-p2w7.