CVE-2024-4288 Cross-site scripting in Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin

Medium 6.4 Published 16 May 2024 Updated 8 Apr 2026

Authenticated contributors can inject arbitrary scripts via the link parameter, leading to stored XSS execution for other users.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2024-4288?

CVE-2024-4288 is a medium-severity cross-site scripting vulnerability in croixhaug Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin, published on 16 May 2024. 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 Stored Cross-Site Scripting via the ‘link’ parameter in versions up to, and including, 1.6.7.14 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Weakness: CWE-79

Which versions are affected by CVE-2024-4288?

It affects 1 product.

Products include Nsquared Simply Schedule Appointments.

How do I fix CVE-2024-4288?

No fix has been published for CVE-2024-4288 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2024-4288 being exploited?

There is no known exploitation of CVE-2024-4288 in the wild and no public exploit code.

Sources

Also known as GHSA-gqvv-5f2f-89ff.