CVE-2026-4003 (GCVE-0-2026-4003)
Vulnerability from cvelistv5 – Published: 2026-04-08 03:36 – Updated: 2026-04-08 16:42
VLAI
EPSS
VEX
Title
Users manager – PN <= 1.1.15 - Unauthenticated Privilege Escalation via Account Takeover via 'userspn_form_save' AJAX Action
Summary
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.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-08 14:48 UTC
CWE
- CWE-862 - Missing Authorization
Assigner
Wordfence
CNA
References
12 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| felixmartinez | Users manager – PN |
Affected:
0 , ≤ 1.1.15
(semver)
|
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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