Ninja Forms <= 3.6.25 - Authenticated (Administrator+) Stored HTML Injection
Strategic Overview
- Status
- Patched in 3.6.26
- Affected Plugin
- Ninja Forms – The Contact Form Builder That Grows With You
- Affected Version
<= 3.6.25- CVSS
- 4.4Medium
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2023-4109
At a glance
CVE-2023-4109 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Ninja Forms WordPress plugin, affecting versions <= 3.6.25. It carries a CVSS score of 4.4 (reachable over the network). Exploitation requires an authenticated account at Administrator level or above. The issue is fixed in version 3.6.26; sites on affected versions should update now. Disclosed August 2023, reported by Sayandeep Dutta.
Vulnerability Overview
The Ninja Forms plugin for WordPress is vulnerable to Stored HTML Injection in versions up to, and including, 3.6.25 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers with administrator access to inject arbitrary HTML content in pages that will execute whenever a user accesses an injected page.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, and no interaction from a victim user.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Reaching this weakness in Ninja Forms <= 3.6.25 takes an account at Administrator level or above. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.
Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Ninja Forms the fix is 3.6.26: builds <= 3.6.25 are affected, anything from 3.6.26 onward is not.
Remediation
Update to version 3.6.26, or a newer patched version
How does WordSec protect against this?
An attacker needs Administrator access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Ninja Forms 3.6.26 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Same weakness class
Other vulnerabilities in Ninja Forms – The Contact Form Builder That Grows With You
- 9.8Ninja Forms Contact Form Code Injection
- 9.8CVE-2019-15025: Ninja Forms Contact Form <= 3.3.21.1 SQL Injection
CVE-2019-15025 - 9.8CVE-2016-1209: Ninja Forms Contact Form… Arbitrary File Upload
CVE-2016-1209 - 9.1CVE-2018-20981: Ninja Forms Insufficient Restrictions during Export
CVE-2018-20981 - 8.8Ninja Forms Contact Form CSRF to Field Import and PHP Object Injection
- 8.8CVE-2021-24163: Ninja Forms Contact Form SendWP Plugin Installation
CVE-2021-24163 - 8.8CVE-2020-36174: Ninja Forms Contact Form CSRF to Plugin Installation
CVE-2020-36174 - 8.8Ninja Forms Contact Form <= 2.9.55.1 SQL Injection
Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C