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CVE-2026-16149— Security Hardener <= 2.4.4 - Authenticated (Subscriber+) Privilege Escalation via REST API '/wp/v2/users' permission_callback Overwrite

Quick assessment

Affected
marc4 Security Hardener
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Marc Armengou Security Hardener是Marc Armengou个人开发者的一款终端安全加固软件。 Marc Armengou Security Hardener 2.4.4及之前版本存在权限许可和访问控制问题漏洞，该漏洞源于缺少授权，插件默认启用的用户枚举保护通过secure_user_endpoints()函数覆盖了/wp/v2/users和/wp/v2/users/(?P<id>[\d]+)路由的权限回调，导致已认证的Subscriber及以上权限攻击者可创建管理员账户或重

CVSS 8.8 · High EPSS 0.59% · P48

Affected Version Matrix 1

VendorProduct Version RangeStatus
marc4 Security Hardener ≤ 2.4.4 affected
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I. Basic Information for CVE-2026-16149

Vulnerability Information
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Vulnerability Title
Security Hardener <= 2.4.4 - Authenticated (Subscriber+) Privilege Escalation via REST API '/wp/v2/users' permission_callback Overwrite
Source: CVE Program / CVE List V5
Vulnerability Description
The Security Hardener plugin for WordPress is vulnerable to Missing Authorization in all versions up to, and including, 2.4.4. The vulnerability exists because the plugin's user-enumeration protection, which is enabled by default, hooks the rest_endpoints filter via secure_user_endpoints() and overwrites every registered handler's permission_callback on both the /wp/v2/users and /wp/v2/users/(?P<id>[\d]+) routes — including POST, PUT, PATCH, and DELETE handlers — with a bare closure that returns only is_user_logged_in(), completely stripping WordPress Core's original capability checks such as create_users, promote_user, edit_users, and delete_users that WP_REST_Users_Controller normally enforces. This makes it possible for authenticated attackers with Subscriber-level access and above to create new Administrator accounts by sending POST request to /wp/v2/users with administrator role, or to reset an existing Administrator's password by issuing a PUT/POST request to /wp/v2/users/<id>. Because the block_user_enum option defaults to enabled, no special plugin configuration is required — the overwrite is active on every request as soon as the plugin is installed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Marc Armengou Security Hardener 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Marc Armengou Security Hardener是Marc Armengou个人开发者的一款终端安全加固软件。 Marc Armengou Security Hardener 2.4.4及之前版本存在权限许可和访问控制问题漏洞，该漏洞源于缺少授权，插件默认启用的用户枚举保护通过secure_user_endpoints()函数覆盖了/wp/v2/users和/wp/v2/users/(?P<id>[\d]+)路由的权限回调，导致已认证的Subscriber及以上权限攻击者可创建管理员账户或重
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
marc4 Security Hardener 0 ~ 2.4.4 -

II. Public POCs for CVE-2026-16149

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III. Intelligence Information for CVE-2026-16149

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Patches & Fixes for CVE-2026-16149 (1)

Vendor Advisories for CVE-2026-16149 (1)

IV. Related Vulnerabilities

Same weakness: CWE-269