CVE-2016-20070 WordPress Booking Calendar Contact Form 1.0.23 Privilege Escalation Stored XSS
Authenticated users can inject malicious scripts via plugin parameters, leading to arbitrary JavaScript execution in administrator browsers and potential privilege escalation.
- 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-2016-20070?
CVE-2016-20070 is a medium-severity cross-site scripting vulnerability in dwbooster Booking Calendar Contact Form, 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 Booking Calendar Contact Form 1.0.23 contains privilege escalation and stored cross-site scripting vulnerabilities that allow authenticated users to modify plugin options and inject malicious scripts by failing to verify user privileges and sanitize input parameters. Attackers with subscriber-level accounts can inject XSS payloads through parameters like price, name, calendar_language, and email_confirmation_to_user via admin-ajax.php and admin.php endpoints to execute arbitrary JavaScript in administrator browsers.
Weakness: CWE-79
Which versions are affected by CVE-2016-20070?
How do I fix CVE-2016-20070?
No fix has been published for CVE-2016-20070 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-2016-20070 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2016-20070 exists.
Sources
Also known as GHSA-fc95-cx3j-mr5q.