CVE-2026-6742

Advanced iFrame <= 2026.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via Gutenberg Block 'additional' Attribute

2026-07-07 23:30
Osvaldo Noe Gonzalez Del Rio (Os)

Strategic Overview

Status
Patched in 2026.2
Affected Plugin
Advanced iFrame
Affected Version
<= 2026.1
CVSS
6.4Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2026-6742
View all Advanced iFrame vulnerabilities

At a glance

CVE-2026-6742 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Advanced iFrame WordPress plugin, affecting versions <= 2026.1. It carries a CVSS score of 6.4 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Contributor level or above. The issue is fixed in version 2026.2; sites on affected versions should update now. Disclosed July 2026, reported by Osvaldo Noe Gonzalez Del Rio (Os).

Vulnerability Overview

The Advanced iFrame plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'additional' parameter in all versions up to, and including, 2026.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, 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')

Advanced iFrame <= 2026.1 carries this weakness at additional, and reaching it takes an account at Contributor level or above. 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 Advanced iFrame the fix is 2026.2: builds <= 2026.1 are affected, anything from 2026.2 onward is not.

Remediation

Update to version 2026.2, or a newer patched version

How does WordSec protect against this?

An attacker needs Contributor access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Advanced iFrame 2026.2 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-6742https://www.wordfence.com/threat-intel/vulnerabilities/id/2b9c4ca8-e5cd-4c4f-8d81-b06367c89fd7https://nvd.nist.gov/vuln/detail/CVE-2026-6742

Related records

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