CVE-2025-11723

Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.9.5 - Unauthenticated Sensitive Information Exposure

2026-01-05 15:10

Strategic Overview

Status: Patched in 1.6.9.6
Affected Plugin: Simply Schedule Appointments
Affected Version: <= 1.6.9.5
CVSS: 6.5Medium
Weakness type: CWE-330 · Use of Insufficiently Random Values
CVE: CVE-2025-11723

View all Simply Schedule Appointments vulnerabilities

At a glance

CVE-2025-11723 is a medium-severity Use of Insufficiently Random Values vulnerability in the Simply Schedule Appointments WordPress plugin, affecting versions <= 1.6.9.5. It carries a CVSS score of 6.5 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.6.9.6; sites on affected versions should update now. Disclosed January 2026, reported by Lucas Montes (NiRoX).

Vulnerability Overview

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 1.6.9.5 via the hash() function due to use of a hardcoded fall-back salt. This makes it possible for unauthenticated attackers to generate a valid token across sites running the plugin that have not manually set a salt in the wp-config.php file and access booking information that will allow them to make modifications.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-330: Use of Insufficiently Random Values

The product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers.

Remediation

Update to version 1.6.9.6, or a newer patched version

How does WordSec protect against this?

This one needs no account at all, which puts it outside what login hardening can reach; WordSec's login security narrows the account-level paths around it, and the firewall is what inspects the request itself. None of that substitutes for the fix: Simply Schedule Appointments 1.6.9.6 closes this, and updating the plugin is the step that ends it.

Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2025-11723 https://www.wordfence.com/threat-intel/vulnerabilities/id/a5f3fbd2-6152-4a89-8fe9-982120d1a640 https://nvd.nist.gov/vuln/detail/CVE-2025-11723

Related records

Other vulnerabilities in Simply Schedule Appointments

CVSS Vector

6.5

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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