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CVE-2026-15826— WordPress User Profile Builder 处理逻辑错误漏洞

一分钟漏洞结论

影响对象
cozmoslabs User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor
利用判断
存在公开或 AI PoC，应优先验证
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

WordPress User Profile Builder是WordPress基金会的一款用户资料构建插件。 WordPress User Profile Builder 3.16.4及之前版本存在处理逻辑错误漏洞，该漏洞源于wppb_log_in_user()函数对wp_insert_user()返回值调用absint()后再进行is_wp_error()检查，导致类型混淆，可能允许未认证攻击者以管理员身份登录，从而导致站点完全管理接管。

CVSS 9.8 · Critical EPSS 3.90% · P90

公开利用映射 1

Nuclei · 1 CVE-2026-15826.yaml [template]

影响版本矩阵 1

厂商产品 版本范围状态
cozmoslabs User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor ≤ 3.16.4 affected
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一、 漏洞 CVE-2026-15826 基础信息

漏洞信息
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Vulnerability Title
User Profile Builder <= 3.16.4 - Unauthenticated Authentication Bypass via Type Confusion to Administrator Account Takeover via 'username' Parameter
来源: CVE Program / CVE List V5
Vulnerability Description
The User Profile Builder plugin for WordPress is vulnerable to Authentication Bypass via Type Confusion in versions up to, and including, 3.16.4. This is due to the wppb_log_in_user() function calling absint() on the return value of wp_insert_user() before performing an is_wp_error() check — when a registration is submitted with a 61–70 character username, WordPress core rejects it with a WP_Error object, but absint() coerces that object to the integer 1 before the error check can short-circuit execution, causing the plugin to bind and return a transient-backed autologin nonce tied to user ID 1. This makes it possible for unauthenticated attackers to log in as the site's Administrator account (user ID 1), resulting in full administrative takeover of the site.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
不正确的类型转换
来源: CVE Program / CVE List V5
Vulnerability Title
WordPress User Profile Builder 处理逻辑错误漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
WordPress User Profile Builder是WordPress基金会的一款用户资料构建插件。 WordPress User Profile Builder 3.16.4及之前版本存在处理逻辑错误漏洞，该漏洞源于wppb_log_in_user()函数对wp_insert_user()返回值调用absint()后再进行is_wp_error()检查，导致类型混淆，可能允许未认证攻击者以管理员身份登录，从而导致站点完全管理接管。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD

受影响产品

厂商 产品 影响版本 CPE 订阅
cozmoslabs User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor 0 ~ 3.16.4 -

二、漏洞 CVE-2026-15826 的公开POC

# POC 描述 源链接 神龙链接
1 The User Profile Builder plugin for WordPress version 3.16.4 is vulnerable to an authentication bypass via type confusion. Profile Builder's automatic-login-after-registration handler passes the return value of wp_insert_user() through absint() before testing it with is_wp_error(), so the error check runs against the already-coerced integer. A registration submitted with a 61-70 character username passes the plugin's own validation but is rejected by WordPress core, because the user_login column is VARCHAR(60), and wp_insert_user() returns a WP_Error object. absint() coerces that object to the integer 1, is_wp_error(1) is false, and the plugin binds a transient-backed autologin nonce to user ID 1. Consuming that nonce calls wp_set_auth_cookie(1) and logs the unauthenticated attacker in as the site's Administrator. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-15826.yaml POC详情
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三、漏洞 CVE-2026-15826 的情报信息

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CVE-2026-15826 补丁与修复 (2)

CVE-2026-15826 新闻报道 (1)

IV. Related Vulnerabilities

Same product: User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor
Same vendor: cozmoslabs
Same weakness: CWE-704

V. Comments for CVE-2026-15826

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