Cyber Resilience

CVE-2026-39109

Critical

Published: 20 April 2026

Published
20 April 2026
Modified
20 April 2026
KEV Added
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Patch
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CVSS Score v3.1 9.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
EPSS Score 0.0032 24.2th percentile
Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-39109 is a critical-severity SQL Injection (CWE-89) vulnerability in Phpgurukul (inferred from references). Its CVSS base score is 9.4 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 24.2th 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 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Deeper analysis

CVE-2026-39109, published on 2026-04-20, is a SQL injection vulnerability (CWE-89) in the Apartment Visitors Management System version 1.1. The issue affects the username parameter on the login page (index.php), enabling manipulation of backend SQL queries.

An unauthenticated attacker can exploit this vulnerability remotely over the network with low attack complexity, no privileges, and no user interaction required. Exploitation allows retrieval of sensitive database contents during authentication attempts, yielding a CVSS v3.1 base score of 9.4 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L) with high impacts on confidentiality and integrity, and low impact on availability.

Advisories and further details are available in the referenced sources, including a GitHub repository documenting CVEs for the system at https://github.com/efekaanakkar/Apartment-Visitors-Management-System-CVEs/, the project download page at https://phpgurukul.com/?sdm_process_download=1&download_id=21524, and the main project page at https://phpgurukul.com/apartment-visitors-management-system-using-php-and-mysql/.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability details

SQL Injection vulnerability in Apartment Visitors Management System Apartment Visitors Management System V1.1 within the username parameter of the login page (index.php). This allows an unauthenticated attacker to manipulate backend SQL queries during authentication and retrieve sensitive database contents.

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 →
T1213.006 Databases Collection
Adversaries may leverage databases to mine valuable information.
attack.mitre.org →
Why these techniques?

SQL injection in public-facing web login page enables T1190 (exploit public-facing application); facilitates arbitrary database queries for T1213.006 (data from databases).

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

CVEs Like This One

CVE-2018-25199Shared CWE-89
CVE-2026-27179Shared CWE-89
CVE-2025-0308Shared CWE-89
CVE-2019-25581Shared CWE-89
CVE-2026-27885Shared CWE-89
CVE-2019-25479Shared CWE-89
CVE-2026-1476Shared CWE-89
CVE-2019-25526Shared CWE-89
CVE-2025-69365Shared CWE-89
CVE-2019-25573Shared CWE-89

Affected Assets

Phpgurukul
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inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match
prevent

Directly prevents SQL injection by requiring validation of untrusted inputs like the username parameter on the login page to block query manipulation.

SI-2 Flaw Remediation good match
prevent

Mandates timely remediation of the specific SQL injection flaw in Apartment Visitors Management System V1.1's index.php login functionality.

SI-9 Information Input Restrictions partial match
prevent

Restricts types and quantities of username inputs to limit SQL injection payloads during unauthenticated login attempts.

References