CVE-2026-96573 Cross-site scripting in Appointment Hour Booking – Booking Calendar
Unauthenticated attackers can inject arbitrary scripts via the booking form, executing them when users view the calendar list if specific settings are enabled.
- 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-2026-96573?
CVE-2026-96573 is a high-severity cross-site scripting vulnerability in codepeople Appointment Hour Booking – Booking Calendar, published on 1 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Appointment Hour Booking – Booking Calendar plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via Booking Form Single-Line Field via Schedule Calendar List Renderer in all versions up to, and including, 1.5.97 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitation requires the 'list_readmore_numberofwords' Other Parameters setting to be configured with a positive integer value; the default value of 0 bypasses the decode-and-truncate branch entirely and is not exploitable through this sink.
Weakness: CWE-79
Which versions are affected by CVE-2026-96573?
How do I fix CVE-2026-96573?
No fix has been published for CVE-2026-96573 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-2026-96573 being exploited?
There is no known exploitation of CVE-2026-96573 in the wild and no public exploit code.
Sources
Also known as GHSA-8899-xhvc-pc43.