Users manager – PN <= 1.1.15 - Unauthenticated Privilege Escalation via Account Takeover via 'userspn_form_save' AJAX Action

Wordfence Intelligence   >   Vulnerability Database   >   Users manager – PN <= 1.1.15 - Unauthenticated Privilege Escalation via Account Takeover via 'userspn_form_save' AJAX Action
9.8
Missing Authorization
CVE CVE-2026-4003
CVSS 9.8 (Critical)
Publicly Published April 7, 2026
Last Updated April 8, 2026
Researcher BaroHaf - fpt

Description

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 supplied, execution bypasses this check entirely and proceeds to update arbitrary user meta via update_user_meta() without any authentication or authorization verification. Additionally, the nonce required for this AJAX endpoint ('userspn-nonce') is exposed to all visitors via wp_localize_script on the public wp_enqueue_scripts hook, rendering the nonce check ineffective as a security control. This makes it possible for unauthenticated attackers to update arbitrary user metadata for any user account, including the userspn_secret_token field.

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Vulnerability Details for Users manager – PN

Users manager – PN

Software Type Plugin
Software Slug userspn (view on wordpress.org)
Patched? Yes
Remediation Update to version 1.1.20, or a newer patched version
Affected Version
  • <= 1.1.15
Patched Version
  • 1.1.20

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