Simple Basic Contact Form <= 20221201 - Reflected Cross-Site Scripting
Strategic Overview
- Status
- Patched in 20240502
- Affected Plugin
- Simple Basic Contact Form
- Affected Version
<= 20221201- CVSS
- 6.1Medium
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2024-4150
At a glance
CVE-2024-4150 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Simple Basic Contact Form WordPress plugin, affecting versions <= 20221201. It carries a CVSS score of 6.1 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 20240502; sites on affected versions should update now. Disclosed May 2024, reported by Krzysztof Zając.
Vulnerability Overview
The Simple Basic Contact Form plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the ‘scf_email’ parameter in versions up to, and including, 20221201 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Simple Basic Contact Form <= 20221201 carries this weakness at scf_email, and reaching it takes a caller who can reach the endpoint. 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 Simple Basic Contact Form the fix is 20240502: builds <= 20221201 are affected, anything from 20240502 onward is not.
Remediation
Update to version 20240502, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to Simple Basic Contact Form: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Simple Basic Contact Form 20240502 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Same weakness class
Other vulnerabilities in Simple Basic Contact Form
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