CVE-2016-20084

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.

CVSS 4.0

5.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

CVSS 3.1

7.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

EPSS

0.2% chance of exploitation in the next 30 days; higher than 15% of CVEs (scores of 2026-10-29)

CWE

CWE-79

Published

2026-06-15

Modified

2026-10-29

Record from

the NVD, synced 2026-10-29

References

• https://wordpress.org/plugins/appointment-booking-calendar/
• https://www.exploit-db.com/exploits/39341
• https://www.vulncheck.com/advisories/wordpress-appointment-booking-calendar-privilege-escalation-xss

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