CVE-2016-20084 WordPress appointment-booking-calendar 1.1.24 Privilege Escalation XSS
Unauthenticated attackers can inject persistent XSS payloads into calendar settings, leading to script execution and potential privilege escalation in the admin interface.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2016-20084?
CVE-2016-20084 is a medium-severity cross-site scripting vulnerability in dwbooster Appointment Booking Calendar, published on 15 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
WordPress appointment-booking-calendar 1.1.24 contains multiple privilege escalation vulnerabilities that allow unauthenticated attackers to modify calendar settings and inject persistent cross-site scripting payloads through the admin.php page parameters. Attackers can inject malicious JavaScript into the 'ict' and 'ics' options or the calendar 'name' parameter via GET requests to execute arbitrary scripts when the calendar is displayed or accessed in the administration interface.
Weakness: CWE-79
Which versions are affected by CVE-2016-20084?
How do I fix CVE-2016-20084?
No fix has been published for CVE-2016-20084 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-2016-20084 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2016-20084 exists.
Sources
Also known as GHSA-vqrm-v8pv-6pvf.