CVE-2026-13439
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk33th percentile - higher than 33% of all known CVEs
Summary
The Easy Form Builder by WhiteStudio plugin for WordPress up to version 4.0.11 is vulnerable to unauthenticated privilege escalation to administrator. This is due to the use of a publicly visible session identifier ('sid') as the password reset token and a publicly accessible nonce refresh endpoint, allowing an attacker to reset any WordPress user's password.
Risk Assessment
An attacker can gain full control over the WordPress site by resetting the administrator password without authentication, leading to complete compromise of data confidentiality, integrity, and availability.
Recommendation
Immediately update the Easy Form Builder by WhiteStudio plugin to the latest available version that fixes this vulnerability. As a temporary measure, disable the plugin until the update is applied.
Original NVD description (English source)
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.