Formidable Form Builder <= 4.09.04 - Unauthenticated Stored Cross-Site Scripting
The Formidable Form Builder WordPress plugin before 4.09.05 allows to inject certain HTML Tags like <audio>,<video>,<img>,<a> and<button>.This could allow an unauthenticated, remote attacker to exploit a HTML-injection byinjecting a malicous link. The HTML-injection may trick authenticated users to follow the link. If the Link gets clicked, Javascript code can be executed. The vulnerability is due to insufficient sanitization of the "data-frmverify" tag for links in the web-based entry inspection page of affected systems. A successful exploitation incomibantion with CSRF could allow the attacker to perform arbitrary actions on an affected system with the privileges of the user. These actions include stealing the users account by changing their password or allowing attackers to submit their own code through an authenticated user resulting in Remote Code Execution. If an authenticated user who is able to edit Wordpress PHP Code in any kind, clicks the malicious link, PHP code can be edited.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| WordPress plugin | Formidable Forms – WordPress Form Builder for Contact Forms, Calculators, Quizzes & More | < 4.09.05 | 4.09.05 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H- Weakness (CWE)
CWE-79- Platform
- WordPress
- Package
Formidable Forms – WordPress Form Builder for Contact Forms, Calculators, Quizzes & More- Disclosed
- 28.01.2021
- Updated
- 11.10.2026 10:23
Sources and licenses
Wordfence Intelligence - ef5028a0-6a5a-40ad-92df-ffc988cad389 - Wordfence Intelligence
Copyright 1999-2026 The MITRE Corporation
Copyright 2012-2026 Defiant Inc.
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Vulnerability history: Formidable Forms – WordPress Form Builder for Contact Forms, Calculators, Quizzes & More
All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 27
- First → latest
- 01.2016 09.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 4
- High 6
- Medium 17
Disclosures per year
- 2017: 4
- 2018: 0
- 2019: 1
- 2020: 0
- 2021: 2
- 2022: 2
- 2023: 4
- 2024: 6
- 2025: 0
- 2026: 6
earlier: 2
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Formidable Form Builder <= 4.09.04 - Unauthenticated Stored Cross-Site Scripting this entry
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