Auth bypass in Felixmartinez Users Manager – Pn

CVE-2026-4003

The Users manager – PN plugin for WordPress is vulnerable to Privilege Escalation via Arbitrary User Meta Update in all versions up to and including 1.1.15. This is due to a flawed authorization logic check in the userspn_ajax_nopriv_serve…

Vulnerability class: Broken Access Control

EPSS: 0.002 (47.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-4003?
CVE-2026-4003 is a critical-severity vulnerability in Felixmartinez Users Manager – Pn, classified under Missing Authorization. CVSS score: 9.8/10. Published 2026-04-08.
How severe is CVE-2026-4003?
Critical severity. CVSS v3 base score is 9.8 out of 10.