EUVD-2026-20043
GHSA-f474-j5g7-2pch
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3Description
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.
Analysis
Arbitrary user metadata modification in Users Manager - PN plugin for WordPress (versions ≤1.1.15) allows unaneticated remote attackers to escalate privileges and hijack accounts. The vulnerability stems from flawed authorization logic in userspn_ajax_nopriv_server() that fails to verify authentication when user_id is supplied, combined with publicly exposed nonce values. …
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Remediation
Within 24 hours: identify all WordPress instances running Users Manager - PN plugin and disable or deactivate the plugin immediately as a temporary measure; document affected installations. Within 7 days: contact the plugin vendor for patch availability and timeline; if no patch is released, evaluate alternative user management solutions. …
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External POC / Exploit Code
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