CVE-2026-4003Network attack vector

Unauthenticated account takeover via arbitrary user meta

Published Apr 8, 2026 · Updated Apr 8, 2026

Missing authorization in Félix Martínez Users manager – PN 1.1.15 and earlier allows remote attackers to update arbitrary user metadata. The userspn_ajax_nopriv_server() handler accepts a nonempty user_id in the userspn_form_save case and calls update_user_meta() without authentication or authorization; its publicly exposed userspn-nonce does not restrict access. Supplying another account's identifier permits changes to any user metadata, including userspn_secret_token, enabling account takeover without user interaction.

CVSS severity9.8
Critical
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Félix Martínez Users manager – PN 1.1.15 and earlier allows remote attackers to update arbitrary user metadata. The userspn_ajax_nopriv_server() handler accepts a nonempty user_id in the userspn_form_save case and calls update_user_meta() without authentication or authorization; its publicly exposed userspn-nonce does not restrict access. Supplying another account's identifier permits changes to any user metadata, including userspn_secret_token, enabling account takeover without user interaction.

The record

CVE
CVE-2026-4003
Published
Apr 8, 2026
Updated
Apr 8, 2026
Vendor
Félix Martínez
Product
Users manager – PN
Classifications
CWE-862, T1190, T1098
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.1.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Félix Martínez · Users manager – PNversion=0 <=1.1.15

Published CVSS scores

9.8WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1190Exploit Public-Facing Application
T1098Account Manipulation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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