Known vulnerabilities in Appointment Hour Booking – Booking Calendar

Appointment Hour Booking is a plugin for creating booking forms for appointments with a start time and a defined duration within a schedule.

14Reported vulnerabilities

8.8Highest CVSS score

1.5.91Latest version

10,000+Active installs

What to do now

Update Appointment Hour Booking – Booking Calendar to 1.5.88 or later. 13 of these have a fixed version available. Updating resolves them.

Plugin last updated: August 14, 2026 / Tested up to WordPress: 7.1 / View on wordpress.org

Reported vulnerabilities

Ordered by how urgently they need attention — whether a vulnerability is actually being exploited, and how likely exploitation is, rather than CVSS severity alone.

CVE	Severity	Exploit probability next 30 days	Affected versions	Fixed in	Published
CVE-2019-13505	Medium 6.1	1.4%	1.1.44 to 1.1.44 (inclusive)	`1.1.46`	July 11, 2019
CVE-2021-24712	Medium 5.4	0.6%	Before 1.3.17	`1.3.17`	October 11, 2021
CVE-2022-41692	High 8.8	0.5%	Before 1.3.72	`1.3.72`	November 18, 2022
CVE-2022-1710	Medium 4.8	0.6%	Before 1.3.56	`1.3.56`	June 13, 2022
CVE-2021-24673	Medium 4.8	0.6%	Before 1.3.16	`1.3.16`	October 4, 2021
CVE-2022-4034	High 7.8	0.6%	1.3.72 and earlier	`1.3.73`	November 29, 2022
CVE-2026-65514	Medium 6.4	0.2%	1.5.86 and earlier	`1.5.87`	July 23, 2026
CVE-2022-4035	Medium 6.1	0.7%	1.3.72 and earlier	`1.3.73`	November 29, 2022
CVE-2026-66679	Medium 5.3	0.3%	1.5.91 and earlier	—	August 18, 2026
CVE-2026-16282	Medium 5.3	0.2%	1.5.87 and earlier	`1.5.88`	August 3, 2026
CVE-2024-32720	Medium 5.3	0.4%	1.4.56 and earlier	`1.4.57`	April 22, 2024
CVE-2023-45649	Medium 5.3	0.4%	1.4.23 and earlier	`1.4.24`	October 11, 2023
CVE-2022-4036	Medium 5.3	0.4%	1.3.72 and earlier	`1.3.73`	November 29, 2022
CVE-2026-1083	Medium 4.4	0.3%	0 to 1.5.60 (inclusive)	`1.5.61`	January 28, 2026

Sources: vulnerability records from NVD, exploitation from CISA KEV, exploit probability from EPSS. Affected versions come from CPE ranges or from the reporting CNA.