What is CVE-2026-4540?

CVE-2026-4540 is a high-severity vulnerability in Projectworlds Online Notes Sharing System, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.3/10. Published 2026-03-22.

How severe is CVE-2026-4540?

High severity. CVSS v3 base score is 7.3 out of 10.

SQL Injection in Projectworlds Online Notes Sharing System

CVE-2026-4540

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

Published 2026-03-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.004 (32.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.001

Affected products

Projectworlds Online Notes Sharing System — versions 1.0

Weakness classification (CWE)

References

vuldb.com/ (technical-description, vdb-entry)
vuldb.com/ (signature, permissions-required)
vuldb.com/ (third-party-advisory)
github.com/juzidddd/CVE/issues/4 (issue-tracking, exploit)

Frequently asked questions

What is CVE-2026-4540?: CVE-2026-4540 is a high-severity vulnerability in Projectworlds Online Notes Sharing System, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.3/10. Published 2026-03-22.
How severe is CVE-2026-4540?: High severity. CVSS v3 base score is 7.3 out of 10.