CVE-2016-20084

HIGH

WordPress appointment-booking-calendar 1.1.24 Privilege Escalation XSS

Title source: cna
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2016-20084. PoCs published by i0akiN SEC-LABORATORY.

AI-analyzed exploit summary The exploit demonstrates a privilege escalation and persistent XSS vulnerability in the WordPress appointment-booking-calendar plugin. It includes functional PoC code that crafts malicious GET requests to update calendar settings and inject XSS payloads.

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.

Exploits (1)

exploitdb WORKING POC
by i0akiN SEC-LABORATORY · textwebappsphp
https://www.exploit-db.com/exploits/39341

The exploit demonstrates a privilege escalation and persistent XSS vulnerability in the WordPress appointment-booking-calendar plugin. It includes functional PoC code that crafts malicious GET requests to update calendar settings and inject XSS payloads.

Classification
Working Poc 95%
Attack Type
Xss
Complexity
Trivial
Reliability
Reliable
Target: WordPress appointment-booking-calendar <=1.1.24
No auth needed
Prerequisites: Access to the target WordPress admin interface
devstral-2 · analyzed Jun 15, 2026 Full analysis →

References (3)

Core 3
Core References
Exploit exploit
ExploitDB-39341
https://www.exploit-db.com/exploits/39341
Third Party Advisory third-party-advisory
VulnCheck Advisory: WordPress appointment-booking-calendar 1.1.24 Privilege Escalation XSS
https://www.vulncheck.com/advisories/wordpress-appointment-booking-calendar-privilege-escalation-xss

Scores

CVSS v3 7.2
EPSS 0.0024
EPSS Percentile 15.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (1)
dwbooster/Booking Calendar Contact < 1.1.24
Published Jun 15, 2026
Tracked Since Jun 15, 2026