Easy Form Builder by WhiteStudio <= 4.0.11 — Unauthenticated Privilege Escalation to Administrator via Password Recovery REST Endpoint
CVE-2026-13439Published · Updated Action summary
Affected: ≤4.0.11Update to 4.0.12 or newer
All remediation steps- Severity
- Critical9.8
- CVSS
- 9.8CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:HConfidentiality- High
I:HIntegrity- High
A:HAvailability- High
- Weakness
- CWE-269 Privilege Escalation
- Required access
- No account needed
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Easy Form Builder by WhiteStudio – Drag & Drop Form Builder easy-form-builder
- Affected≤ 4.0.11
- Patched in4.0.12
Update to 4.0.12 or newer.
You are affected if you run ≤ 4.0.11. Version 4.0.12 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Easy Form Builder by WhiteStudio – Drag & Drop Form Builder.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 4.0.12, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Easy Form Builder by WhiteStudio – Drag & Drop Form Builder to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to CHOIGYEONGMIN.
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.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in Easy Form Builder by WhiteStudio – Drag & Drop Form Builder
All 12| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | 4.1.3 - Unauthenticated Stored Cross-Site Scripting 4.0.0 – 4.1.3Update to 4.2.0 | CVE-2026-85122 | |
| Medium5.3 | 4.1.3 - Missing Authorization 4.0.0 – 4.1.3Update to 4.2.0 | CVE-2026-85123 | |
| High7.2 | Unauthenticated Stored Cross-Site Scripting ≤4.0.12Update to 4.0.13 | CVE-2026-59517 | |
| High7.5 | Unauthenticated SQL Injection ≤4.0.6Update to 4.0.7 | CVE-2026-42747 | |
| Medium5.3 | Missing Authorization to Authenticated (Subscriber+) Sensitive Form Response Data Exposure ≤3.9.3Update to 3.9.4 | CVE-2025-14067 |
- High7.24.1.3 - Unauthenticated Stored Cross-Site Scripting
4.0.0 – 4.1.3Update to 4.2.0
- Medium5.34.1.3 - Missing Authorization
4.0.0 – 4.1.3Update to 4.2.0
- High7.2Unauthenticated Stored Cross-Site Scripting
≤4.0.12Update to 4.0.13
- High7.5Unauthenticated SQL Injection
≤4.0.6Update to 4.0.7
- Medium5.3Missing Authorization to Authenticated (Subscriber+) Sensitive Form Response Data Exposure
≤3.9.3Update to 3.9.4
Same weakness (Privilege Escalation)
All Privilege Escalation| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header | CVE-2026-120688 | |
| Critical9.8 | Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission | CVE-2026-125055 | |
| Critical9.8 | Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter | CVE-2026-119077 | |
| Medium5.3 | Unauthenticated Sensitive Information Exposure in 'search' Parameter | CVE-2026-121518 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Comment User-Agent Header
EZ SQL Reports Shortcode Widget and DB Backup
≤5.25.25Update to 5.26.45
- Critical9.8Unauthenticated Arbitrary File Upload via File Upload via Public Form Submission
Chatterbug Forms – Fast, Flexible WordPress Form Builder
≤1.0.2Update to 1.1
- Critical9.8Unauthenticated PHP Object Injection to Remote Code Execution via 'form' Parameter
ELEX WordPress HelpDesk & Customer Ticketing System
≤3.3.9Update to 3.4.0
- Medium5.3Unauthenticated Sensitive Information Exposure in 'search' Parameter
Customer Reviews for WooCommerce
≤5.127.0Update to 5.128.0
Timeline
CVE published
Severity critical, CVSS 9.8
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.