CVE-2020-20406

Elementor Website Builder <= 2.9.2 - Stored Cross-Site Scripting

2020-02-26 00:00
yzy9951

Strategic Overview

Status
Patched in 2.9.3
Affected Plugin
Elementor Website Builder – more than just a page builder
Affected Version
<= 2.9.2
CVSS
6.4Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2020-20406
View all Elementor Website Builder – more than just a page builder vulnerabilities

At a glance

CVE-2020-20406 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Elementor Website Builder WordPress plugin, affecting versions <= 2.9.2. It carries a CVSS score of 6.4 (reachable over the network; low attack complexity). The issue is fixed in version 2.9.3; sites on affected versions should update now. Disclosed February 2020, reported by yzy9951.

Vulnerability Overview

A stored XSS vulnerability exists in the Custom Link Attributes control Affect function in Elementor Page Builder 2.9.2 and earlier versions. It is caused by inadequate filtering on the link custom attributes.

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 interaction from a victim user.

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

Reaching this weakness in Elementor Website Builder <= 2.9.2 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 Elementor Website Builder the fix is 2.9.3: builds <= 2.9.2 are affected, anything from 2.9.3 onward is not.

Remediation

Update to version 2.9.3, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Elementor Website Builder: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Elementor Website Builder 2.9.3 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2020-20406https://www.wordfence.com/threat-intel/vulnerabilities/id/877a42c9-958d-46ed-8f9a-5972bd5f43f8https://nvd.nist.gov/vuln/detail/CVE-2020-20406

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C