NEX-Forms — Ultimate Form Builder <= 8.4.3 - Authenticated Stored Cross-Site Scripting via Form Name
CVE-2023-0439Published · Updated Action summary
Affected: ≤8.4.3Update to 8.4.4 or newer
All remediation steps- Severity
- Medium4.8
- CVSS
- 4.8CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:HPrivileges required- High
UI:RUser interaction- Required
S:CScope- Changed
C:LConfidentiality- Low
I:LIntegrity- Low
A:NAvailability- None
- Weakness
- CWE-79 Cross-Site Scripting
- Required access
- Unknown
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
NEX-Forms – Ultimate Forms Plugin for WordPress nex-forms-express-wp-form-builder
- Affected≤ 8.4.3
- Patched in8.4.4
Update to 8.4.4 or newer.
You are affected if you run ≤ 8.4.3. Version 8.4.4 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under NEX-Forms – Ultimate Forms Plugin for WordPress.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 8.4.4, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch NEX-Forms – Ultimate Forms Plugin for WordPress to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Felipe Restrepo Rodriguez (pfelilpe), Edison Poveda.
The NEX-Forms - Ultimate Form Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via form names parameter in versions up to, and including, 8.4.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers with administrator-level access to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The plugin has the option to allow lower-level users access to the form, which may make this issue exploitable by lower-privileged users in some instances.
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 NEX-Forms – Ultimate Forms Plugin for WordPress
All 44| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High7.2 | Unauthenticated Stored Cross-Site Scripting via Content-Type Header ≤9.3.2Update to 9.3.3 | CVE-2026-96767 | |
| Medium5.3 | 9.3.0 - Unauthenticated Insecure Direct Object Reference 9.2.1 – 9.3.0Update to 9.3.1 | CVE-2026-106166 | |
| Medium6.4 | Authenticated (Subscriber+) Stored Cross-Site Scripting ≤9.3.1Update to 9.3.2 | CVE-2026-96607 | |
| Medium4.9 | Authenticated (Administrator+) SQL Injection via 'operator' Key of the 'additional_params' Parameter ≤9.3.0Update to 9.3.1 | CVE-2026-75961 | |
| Medium4.9 | Authenticated (Admin+) SQL Injection via 'additional_params' Parameter ≤9.2.4Update to 9.2.5 | CVE-2026-15602 |
- High7.2Unauthenticated Stored Cross-Site Scripting via Content-Type Header
≤9.3.2Update to 9.3.3
- Medium5.39.3.0 - Unauthenticated Insecure Direct Object Reference
9.2.1 – 9.3.0Update to 9.3.1
- Medium6.4Authenticated (Subscriber+) Stored Cross-Site Scripting
≤9.3.1Update to 9.3.2
- Medium4.9Authenticated (Administrator+) SQL Injection via 'operator' Key of the 'additional_params' Parameter
≤9.3.0Update to 9.3.1
- Medium4.9Authenticated (Admin+) SQL Injection via 'additional_params' Parameter
≤9.2.4Update to 9.2.5
Same weakness (Cross-Site Scripting)
All Cross-Site Scripting| 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 medium, CVSS 4.8
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- [object Object]. 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.