CVE-2023-4950

Funnelforms Free <= 3.3.9 - Unauthenticated Stored Cross-Site Scripting

2023-09-18 00:00

Strategic Overview

Status: Patched in 3.4
Affected Plugin: Interactive Contact Form and Multi Step Form Builder with Drag & Drop Editor – Funnelforms Free
Affected Version: < 3.4
CVSS: 6.5Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2023-4950

View all Interactive Contact Form and Multi Step Form Builder with Drag & Drop Editor – Funnelforms Free vulnerabilities

At a glance

CVE-2023-4950 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Interactive Contact Form and Multi Step Form Builder with Drag & Drop Editor WordPress plugin, affecting versions < 3.4. It carries a CVSS score of 6.5 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 3.4; sites on affected versions should update now. Disclosed September 2023, reported by Malek Althubiany.

Vulnerability Overview

The Funnelforms Free plugin for WordPress is vulnerable to Stored Cross-Site Scripting via form submission answers in versions up to, and including, 3.3.9 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts 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, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Reaching this weakness in Interactive Contact Form and Multi Step Form Builder with Drag & Drop Editor < 3.4 takes no account at all. 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 Interactive Contact Form and Multi Step Form Builder with Drag & Drop Editor the fix is 3.4: builds < 3.4 are affected, anything from 3.4 onward is not.

Remediation

Update to version 3.4, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Interactive Contact Form and Multi Step Form Builder with Drag & Drop Editor 3.4 closes this, and updating the plugin is the step that ends it.

Firewall
Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2023-4950 https://www.wordfence.com/threat-intel/vulnerabilities/id/ebcbf872-1420-4a57-a4b4-8a52ba74e0a1 https://nvd.nist.gov/vuln/detail/CVE-2023-4950

Related records

Same weakness class

Other vulnerabilities in Interactive Contact Form and Multi Step Form Builder with Drag & Drop Editor – Funnelforms Free

CVSS Vector

6.5

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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