Denial of Service Vulnerability in Appointment Booking Calendar Plugin for WordPress
CVE-2026-7493

5.3MEDIUM

Key Information:

Vendor

WordPress
Status
Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin
Vendor
CVE Published:
27 May 2026

What is CVE-2026-7493?

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin for WordPress has a vulnerability that allows unauthenticated attackers to exploit a publicly accessible REST API endpoint. Specifically, the endpoint (/wp-json/ssa/v1/async) calls PHP's sleep() function using a user-supplied delay without any rate limiting, enabling attackers to exhaust PHP worker processes. This denial of service can prevent legitimate users from accessing the site, posing a significant risk to website availability.

Affected Version(s)

Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin 0 <= 1.6.11.5

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/simply-schedul...

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

lucky_buddy
.