CVE-2017-18600

Premium WordPress Form Builder <= 3.2.31 - Authenticated Stored Cross-Site Scripting

2017-07-26 00:00

Strategic Overview

Status: Patched in 3.4
Affected Plugin: FormCraft
Affected Version: < 3.4
CVSS: 5.4Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2017-18600

At a glance

CVE-2017-18600 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the FormCraft WordPress plugin, affecting versions < 3.4. It carries a CVSS score of 5.4 (reachable over the network; low attack complexity). Exploitation requires an authenticated account. The issue is fixed in version 3.4; sites on affected versions should update now. Disclosed July 2017, reported by 8bitsec.

Vulnerability Overview

The formcraft3 plugin before 3.4 for WordPress has stored XSS via the "New Form > Heading > Heading Text" field.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed.

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

Reaching this weakness in FormCraft < 3.4 takes any authenticated account. 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 FormCraft 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?

The attempt arrives as an ordinary request to FormCraft: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: FormCraft 3.4 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2017-18600 https://www.wordfence.com/threat-intel/vulnerabilities/id/0d943691-66cf-4018-9eb6-5f20db0a95a9 https://nvd.nist.gov/vuln/detail/CVE-2017-18600

Related records

Same weakness class

Other vulnerabilities in FormCraft

4.3CVE-2024-13783: FormCraft Plugin Data Export in formcraft-main.phpCVE-2024-13783

CVSS Vector

5.4

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionRequired
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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