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

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Summary

CVECVE-2026-4003
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-08 05:16:06 UTC
Updated2026-04-08 21:26:35 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.005050000 probability, percentile 0.661870000 (date 2026-04-14)

Problem Types: CWE-862 | CWE-862 CWE-862 Missing Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Felixmartinez Users Manager PN affected 1.1.15 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/userspn/trunk/includes/class-userspn-ajax-nopriv.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/userspn/tags/1.0.31/includes/class-userspn-ajax-nopri... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/userspn/tags/1.0.31/includes/class-userspn-ajax-nopri... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/userspn/trunk/includes/class-userspn-common.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/userspn/trunk/includes/class-userspn-functions-user.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/userspn/tags/1.0.31/includes/class-userspn-ajax-nopri... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/userspn/tags/1.0.31/includes/class-userspn-functions-... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/userspn/trunk/includes/class-userspn-ajax-nopriv.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/userspn/trunk/includes/class-userspn-ajax-nopriv.php [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/27bb60c1-43fa-4a18-b9ca-05953... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/userspn/tags/1.0.31/includes/class-userspn-common.php [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: HA GIA BAO (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-03-12T22:34:37.000ZVendor Notified
CNA2026-04-07T15:32:12.000ZDisclosed
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