Avada <= 7.4.1 - Stored Cross-Site Scripting

2021-09-10 00:00
Theme Fusion

Strategic Overview

Status
Patched in 7.4.2
Affected Theme
Avada | Website Builder For WordPress & WooCommerce
Affected Version
<= 7.4.1
CVSS
6.4Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE pending
View all Avada | Website Builder For WordPress & WooCommerce vulnerabilities

At a glance

This record tracks a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Avada WordPress theme, affecting versions <= 7.4.1. It carries a CVSS score of 6.4 (reachable over the network; low attack complexity). The issue is fixed in version 7.4.2; sites on affected versions should update now. Disclosed September 2021, reported by Theme Fusion.

Vulnerability Overview

The Avada plugin for WordPress is vulnerable to Stored Cross-Site Scripting via improper escaping of HTML form entries in the backend in versions up to, and including, 7.4.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated 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 interaction from a victim user.

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

Reaching this weakness in Avada <= 7.4.1 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 Avada the fix is 7.4.2: builds <= 7.4.1 are affected, anything from 7.4.2 onward is not.

Remediation

Update to version 7.4.2, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Avada: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Avada 7.4.2 closes this, and updating the theme is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.wordfence.com/threat-intel/vulnerabilities/id/e9b58db6-4059-4923-b1e3-3321cc7d3573

Related records

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