CVE-2025-13754Network attack vector

Unauthenticated settings disclosure via admin embed endpoint

Published Dec 19, 2025 · Updated Dec 19, 2025

Missing authorization in Simply Schedule Appointments 1.6.9.16 and earlier allows remote attackers to read private plugin settings. The embed-inner-admin handler in class-shortcodes.php serves the admin single-page application without requiring an authenticated WordPress session. Any network client that can reach the site's REST API can retrieve staff and business configuration, including integration API keys when premium integrations are configured.

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

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Missing authorization in Simply Schedule Appointments 1.6.9.16 and earlier allows remote attackers to read private plugin settings. The embed-inner-admin handler in class-shortcodes.php serves the admin single-page application without requiring an authenticated WordPress session. Any network client that can reach the site's REST API can retrieve staff and business configuration, including integration API keys when premium integrations are configured.

The record

CVE
CVE-2025-13754
Published
Dec 19, 2025
Updated
Dec 19, 2025
Vendor
N Squared Digital, LLC
Product
Simply Schedule Appointments
Classifications
CWE-862, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 19, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=* <=1.6.9.16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

N Squared Digital, LLC · Simply Schedule Appointmentsversion=* <=1.6.9.16

Published CVSS scores

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

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-862Missing Authorization
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo