CVE-2026-7493Network attack vector

Unauthenticated service interruption via unbounded async delay

Published May 27, 2026 · Updated May 27, 2026

Denial of service in Simply Schedule Appointments 1.6.11.5 and earlier allows remote attackers to interrupt WordPress sites via its REST API. The public /wp-json/ssa/v1/async endpoint passes a user-controlled delay to PHP sleep() without rate limiting. No authentication or user interaction is required, and concurrent requests can occupy PHP workers until legitimate site requests cannot be served.

CVSS severity5.3
Medium
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Simply Schedule Appointments 1.6.11.5 and earlier allows remote attackers to interrupt WordPress sites via its REST API. The public /wp-json/ssa/v1/async endpoint passes a user-controlled delay to PHP sleep() without rate limiting. No authentication or user interaction is required, and concurrent requests can occupy PHP workers until legitimate site requests cannot be served.

The record

CVE
CVE-2026-7493
Published
May 27, 2026
Updated
May 27, 2026
Vendor
N Squared Digital, LLC
Product
Simply Schedule Appointments
Classifications
CWE-400, T1499.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.6.11.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

N Squared Digital, LLC · Simply Schedule Appointmentsversion=0 <=1.6.11.5

Published CVSS scores

5.3WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.002Service Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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