# CVE-2026-7493: Simply Schedule Appointments WordPress plugin denial of service

Source: https://junglewise.ai/threats/cve-2026-7493-simply-schedule-appointments-wordpress-plugin-denial-of-service  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-27. Updated: 2026-05-27  
License: CC BY 4.0 with a link back

CVE-2026-7493 · Severity: medium · CVSS 5.3 · Published 2026-05-27

The Simply Schedule Appointments plugin for WordPress, used for managing online bookings and calendars, contains a flaw that allows attackers to crash or slow down a website. By sending specific requests to the plugin, an attacker can force the server to hang, making the site unavailable to legitimate customers and staff. This could lead to lost revenue and disrupted business operations if the booking system is taken offline.

Technologies: [Simply Schedule Appointments Booking Plugin](https://junglewise.ai/threats/technologies/simply-schedule-appointments-booking-plugin). Vendors: [Simply Schedule Appointments](https://junglewise.ai/threats/vendors/simply-schedule-appointments).

## Quick answers

**Is CVE-2026-7493 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-7493 being exploited in the wild.

**How severe is CVE-2026-7493?** Medium severity, with a CVSS score of 5.3, published 27 May 2026.

**Which products and versions are affected?** Simply Schedule Appointments Booking Plugin Up to, and including, 1.6.11.5.

**Is there a fix for CVE-2026-7493?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-7493 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-7493?** Check whether you run Simply Schedule Appointments Booking Plugin at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The Simply Schedule Appointments plugin for WordPress is vulnerable to a Denial of Service (DoS) attack via the '/wp-json/ssa/v1/async' REST API endpoint. The vulnerability stems from the 'class-async-action-model.php' component, which calls the PHP sleep() function using a user-supplied delay parameter without proper rate limiting or validation. An unauthenticated remote attacker can exploit this by sending multiple requests with large delay values, effectively exhausting the server's PHP worker processes. This resource exhaustion prevents the web server from processing legitimate requests. The issue affects all versions up to and including 1.6.11.5.

## Affected products

- Simply Schedule Appointments Simply Schedule Appointments Booking Plugin Up to, and including, 1.6.11.5

## Timeline

- 2026-05-27: advisory: NVD publication date

## References

- [https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.11.2/includes/class-async-action-model.php](https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.11.2/includes/class-async-action-model.php)
- [https://www.wordfence.com/threat-intel/vulnerabilities/id/ae66228e-d086-44fd-8acb-5a99482cedfb?source=cve](https://www.wordfence.com/threat-intel/vulnerabilities/id/ae66228e-d086-44fd-8acb-5a99482cedfb?source=cve)