NSquared Simply Schedule Appointments Plugin up to 1.6.9.27 on WordPress sql injection

Summaryinfo

A vulnerability described as critical has been identified in NSquared Simply Schedule Appointments Plugin up to 1.6.9.27 on WordPress. Affected by this issue is some unknown functionality. Such manipulation leads to sql injection. This vulnerability is referenced as CVE-2026-39495. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in NSquared Simply Schedule Appointments Plugin up to 1.6.9.27 on WordPress. Affected by this issue is an unknown code block. The manipulation with an unknown input leads to a sql injection vulnerability. Using CWE to declare the problem leads to CWE-89. The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in NSquared Simply Schedule Appointments simply-schedule-appointments allows Blind SQL Injection.This issue affects Simply Schedule Appointments: from n/a through <= 1.6.9.27.

The weakness was published by Daroo. The advisory is shared for download at patchstack.com. This vulnerability is handled as CVE-2026-39495 since 04/07/2026. The exploitation is known to be easy. The attack may be launched remotely. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 04/08/2026). The MITRE ATT&CK project declares the attack technique as T1505.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• NSquared

Name

• Simply Schedule Appointments Plugin

Version

• 1.6.9.0
• 1.6.9.1
• 1.6.9.2
• 1.6.9.3
• 1.6.9.4
• 1.6.9.5
• 1.6.9.6
• 1.6.9.7
• 1.6.9.8
• 1.6.9.9
• 1.6.9.10
• 1.6.9.11
• 1.6.9.12
• 1.6.9.13
• 1.6.9.14
• 1.6.9.15
• 1.6.9.16
• 1.6.9.17
• 1.6.9.18
• 1.6.9.19
• 1.6.9.20
• 1.6.9.21
• 1.6.9.22
• 1.6.9.23
• 1.6.9.24
• 1.6.9.25
• 1.6.9.26
• 1.6.9.27

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Once again VulDB remains the best source for vulnerability data.

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