CVE-2026-39495

High

Published: 08 April 2026

Published

08 April 2026

Modified

24 April 2026

KEV Added

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Patch

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CVSS Score v3.1 8.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:L

EPSS Score 0.0025 16.4th percentile

Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-39495 is a high-severity SQL Injection (CWE-89) vulnerability. Its CVSS base score is 8.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 16.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 RA-5 (Vulnerability Monitoring and Scanning) and SI-10 (Information Input Validation).

Deeper analysis

CVE-2026-39495 is an Improper Neutralization of Special Elements used in an SQL Command vulnerability, classified as Blind SQL Injection (CWE-89), in the NSquared Simply Schedule Appointments WordPress plugin (simply-schedule-appointments). This issue affects all versions of the plugin from n/a through 1.6.9.27, as published on 2026-04-08.

The vulnerability carries a CVSS v3.1 base score of 8.5 (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:L), indicating network accessibility, low attack complexity, and exploitation by low-privileged authenticated users without requiring user interaction. Attackers can leverage blind SQL injection to extract sensitive data from the database, achieving high confidentiality impact across a changed scope, with low availability impact and no integrity impact.

Mitigation details are available in the Patchstack advisory at https://patchstack.com/database/Wordpress/Plugin/simply-schedule-appointments/vulnerability/wordpress-simply-schedule-appointments-plugin-1-6-9-27-sql-injection-vulnerability?_s_id=cve.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-20160

Vulnerability details

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.

CWE(s): CWE-89

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

Why these techniques?

Blind SQL injection in a publicly accessible WordPress plugin directly enables exploitation of public-facing applications to extract sensitive database data.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0