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CVE-2026-13439— Easy Form Builder by WhiteStudio <= 4.0.11 - Unauthenticated Privilege Escalation to Administrator via Password Recovery REST Endpoint

Quick assessment

Affected
hassantafreshi Easy Form Builder by WhiteStudio – Drag & Drop Form Builder
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.

WordPress Easy Form Builder by WhiteStudio – Drag & Drop Form Builder是WordPress基金会的一款拖放式表单构建组件。 WordPress Easy Form Builder by WhiteStudio – Drag & Drop Form Builder 4.0.11及之前版本存在权限许可和访问控制问题漏洞，该漏洞源于密码恢复流程使用公开可见的会话标识符（'sid'）作为密码重置令牌，并结合公开可访问的nonce刷新端点，可能导致

CVSS 9.8 · Critical EPSS 0.71% · P52

Affected Version Matrix 1

VendorProduct Version RangeStatus
hassantafreshi Easy Form Builder by WhiteStudio – Drag & Drop Form Builder ≤ 4.0.11 affected
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I. Basic Information for CVE-2026-13439

Vulnerability Information
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Vulnerability Title
Easy Form Builder by WhiteStudio <= 4.0.11 - Unauthenticated Privilege Escalation to Administrator via Password Recovery REST Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
The Easy Form Builder by WhiteStudio plugin for WordPress is vulnerable to Unauthenticated Privilege Escalation to Administrator in versions up to, and including, 4.0.11 This is due to the password recovery flow using the publicly-visible session identifier ('sid') as the password reset token stored in wp_emsfb_temp_links, combined with a publicly-accessible nonce refresh endpoint (Emsfb/v1/nonce/refresh) that issues valid WordPress REST nonces to unauthenticated visitors. This makes it possible for unauthenticated attackers to reset the password of any WordPress user — including administrators — by scraping the public sid from a published login form page, submitting a recovery request for any known user email via Emsfb/v1/forms/message/add, and then calling Emsfb/v1/forms/recovery/efb_set_password with the known sid to set an arbitrary new password and gain full administrator access.
Source: 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
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress Easy Form Builder by WhiteStudio – Drag & Drop Form Builder 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Easy Form Builder by WhiteStudio – Drag & Drop Form Builder是WordPress基金会的一款拖放式表单构建组件。 WordPress Easy Form Builder by WhiteStudio – Drag & Drop Form Builder 4.0.11及之前版本存在权限许可和访问控制问题漏洞，该漏洞源于密码恢复流程使用公开可见的会话标识符（'sid'）作为密码重置令牌，并结合公开可访问的nonce刷新端点，可能导致
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
hassantafreshi Easy Form Builder by WhiteStudio – Drag & Drop Form Builder 0 ~ 4.0.11 -

II. Public POCs for CVE-2026-13439

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III. Intelligence Information for CVE-2026-13439

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Patches & Fixes for CVE-2026-13439 (2)

News Coverage for CVE-2026-13439 (1)

IV. Related Vulnerabilities

Same vendor: hassantafreshi
Same weakness: CWE-269

V. Comments for CVE-2026-13439

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