Risk Letters

Exploited vulnerability

CVE-2026-4003

TLP:CLEAR

Missing Authorization

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_server() function within the 'userspn_form_save' case. The conditional only blocks unauthenticated users when the user_id is empty, but when a non-empty user_id is su

Facts

  • Vendor: Félix Martínez
  • Product: Users manager – PN
  • CVSS: 9.8
  • EPSS (probability of exploitation within 30 days): 0.9 %
  • First known exploitation: 13 October 2026
  • First seen by Risk Letters: 8 April 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD