CVE-2016-20084

HIGH 7.2

WordPress appointment-booking-calendar 1.1.24 Privilege Escalation XSS

CVSS Score

7.2

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	dwbooster
Product	booking calendar contact
Published	Jun 15, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

dwbooster / Booking Calendar Contact

0 ≤ 1.1.24

References

NVD ↗ CVE.org ↗ EPSS Data ↗

exploit-db.com: https://www.exploit-db.com/exploits/39341 wordpress.dwbooster.com: http://wordpress.dwbooster.com/calendars/booking-calendar-contact-form vulncheck.com: https://www.vulncheck.com/advisories/wordpress-appointment-booking-calendar-privilege-escalation-xss

Credits

Joaquin Ramirez Martinez [ i0 security-lab]