CVE-2026-3658 Appointment Booking Calendar <= 1.6.10.0 - Unauthenticated SQL Injection via 'fields' Parameter
Unauthenticated attackers can exploit SQL injection to extract sensitive database information, including user credentials, from 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-2026-3658?
CVE-2026-3658 is a high-severity SQL injection vulnerability in croixhaug Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin, published on 19 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 SQL Injection via the 'fields' parameter in all versions up to, and including, 1.6.10.0 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, including usernames, email addresses, and password hashes.
Weakness: CWE-89
Which versions are affected by CVE-2026-3658?
How do I fix CVE-2026-3658?
No fix has been published for CVE-2026-3658 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-2026-3658 being exploited?
There is no known exploitation of CVE-2026-3658 in the wild and no public exploit code.
Sources
Also known as GHSA-vx4w-426f-69qh.