Cyber Resilience

CVE-2026-4540

Medium

Published: 22 March 2026

Published
22 March 2026
Modified
24 April 2026
KEV Added
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Patch
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CVSS Score v4 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0001 2.4th percentile
Risk Priority 14 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-4540 is a medium-severity Injection (CWE-74) vulnerability. Its CVSS base score is 6.9 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 2.4th 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 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Deeper analysis

CVE-2026-4540 is a SQL injection vulnerability (CWE-74, CWE-89) in projectworlds Online Notes Sharing System 1.0, published on 2026-03-22. The issue resides in the unknown processing of the /login.php file within the Parameters Handler component, where manipulation of the "User" argument triggers the injection.

The vulnerability enables remote exploitation with low complexity and no privileges or user interaction required, per its CVSS 3.1 base score of 7.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L). Attackers can achieve low impacts on confidentiality, integrity, and availability through SQL injection.

Advisories and details on mitigation are available in referenced sources, including VulDB entries (ctiid.352357, id.352357, submit.774686) and a GitHub issue at juzidddd/CVE/issues/4.

The exploit is public and may be used in attacks.

EU & UK References

Vulnerability details

A vulnerability was detected in projectworlds Online Notes Sharing System 1.0. This issue affects some unknown processing of the file /login.php of the component Parameters Handler. The manipulation of the argument User results in sql injection. The attack can be…

more

executed remotely. The exploit is now public and may be used.

CWE(s)
CWE-74CWE-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?

Direct remote SQL injection in public-facing web app (/login.php) enables initial access via exploitation of a public-facing application.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

CVEs Like This One

CVE-2026-3150Shared CWE-74, CWE-89
CVE-2026-3746Shared CWE-74, CWE-89
CVE-2025-2683Shared CWE-74, CWE-89
CVE-2026-5238Shared CWE-74, CWE-89
CVE-2026-4288Shared CWE-74, CWE-89
CVE-2026-2220Shared CWE-74, CWE-89
CVE-2025-1535Shared CWE-74, CWE-89
CVE-2026-0597Shared CWE-74, CWE-89
CVE-2026-1688Shared CWE-74, CWE-89
CVE-2026-5018Shared CWE-74, CWE-89

Affected Assets

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match
prevent

Directly mitigates SQL injection in the 'User' parameter of /login.php by enforcing validation and sanitization of untrusted inputs.

SI-2 Flaw Remediation good match
prevent

Requires timely remediation of the specific SQL injection flaw in Online Notes Sharing System 1.0 through patching or code fixes.

RA-5 Vulnerability Monitoring and Scanning partial match
detect

Enables identification of SQL injection vulnerabilities like CVE-2026-4540 via regular scanning of the application.

References