Formidable Forms <= 5.5.4 — Authenticated (Admin+) Server-Side Request Forgery
f28feb11-7e28-4b97-b529-f6d266c3e534Published · Updated Action summary
Affected: ≤5.5.4Update to 5.5.5 or newer
All remediation steps- Severity
- Medium4.7
- CVSS
- 4.7CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:LWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:HPrivileges required- High
UI:NUser interaction- None
S:UScope- Unchanged
C:LConfidentiality- Low
I:LIntegrity- Low
A:LAvailability- Low
- Weakness
- CWE-918 SSRF
- Required access
- Unknown
- Exploit prediction (EPSS)
- No score
- CISA KEV
- Not listed
On this page8
Am I affected?
Formidable Forms – Contact Form, Survey, Quiz, Payment, Calculator Form & Custom Form Builder formidable
- Affected≤ 5.5.4
- Patched in5.5.5
Update to 5.5.5 or newer.
You are affected if you run ≤ 5.5.4. Version 5.5.5 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Formidable Forms – Contact Form, Survey, Quiz, Payment, Calculator Form & Custom Form Builder.
- No admin access? Run a passive check of your site. It reads public files only.
What to do
- Update to version 5.5.5, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch Formidable Forms – Contact Form, Survey, Quiz, Payment, Calculator Form & Custom Form Builder to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence.
The Formidable Form Builder plugin for WordPress is vulnerable to Server-Side Request Forgery in versions up to, and including, 5.5.4 due to insufficient URL restrictions on the 'plugin' parameter passed to the the install_addon function. This makes it possible for authenticated users, with administrative privileges, to make web requests to arbitrary locations originating from the web application and can be used to query and modify information from internal services.
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 Formidable Forms – Contact Form, Survey, Quiz, Payment, Calculator Form & Custom Form Builder
All 29| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| High8.8 | Authenticated (Subscriber+) Arbitrary Plugin Installation via 'file_url' Parameter ≤6.35Update to 7.0 | CVE-2026-89435 | |
| High7.5 | Unauthenticated Denial of Service <7.0Update to 7.0 | CVE-2026-85642 | |
| Medium5.3 | Unauthenticated Content Injection ≤6.34Update to 6.35 | CVE-2026-85641 | |
| Medium6.5 | Unauthenticated Arbitrary Shortcode Execution ≤6.34Update to 6.35 | CVE-2026-19857 | |
| High7.2 | Unauthenticated Stored Cross-Site Scripting via 'frm_user_id' Parameter ≤6.33.1Update to 6.34 | CVE-2026-18331 |
- High8.8Authenticated (Subscriber+) Arbitrary Plugin Installation via 'file_url' Parameter
≤6.35Update to 7.0
- High7.5Unauthenticated Denial of Service
<7.0Update to 7.0
- Medium5.3Unauthenticated Content Injection
≤6.34Update to 6.35
- Medium6.5Unauthenticated Arbitrary Shortcode Execution
≤6.34Update to 6.35
- High7.2Unauthenticated Stored Cross-Site Scripting via 'frm_user_id' Parameter
≤6.33.1Update to 6.34
Same weakness (SSRF)
All SSRF| 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 4.7
Record last updated
Sources & licenses
- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- 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.