CVE-2026-13439 Details
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.
A vulnerability allowing unauthenticated privilege escalation to administrator level has been identified in the Easy Form Builder by WhiteStudio plugin for WordPress, affecting versions through 4.0.11. The issue arises from the password recovery process, which uses a publicly visible session identifier as the password reset token. This token is stored in a temporary links table, and the plugin includes a nonce refresh endpoint that provides valid WordPress REST nonces to unauthenticated users. Exploitation involves scraping the session identifier from a public login form, sending a recovery request for any user email, and then using the session identifier to reset the password, thereby gaining administrator access.
Users are advised to update the Easy Form Builder by WhiteStudio plugin to version 4.0.12 or later.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 21, 2026CISA-ADP
Assessed Jul 21, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-269 | Improper Privilege Management | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| WhiteStudio Easy Form Builder | <= 4.0.11 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 21, 2026 | CVE Modified | CISA-ADP |
| Jul 21, 2026 | New CVE Received | [email protected] |