CVE-2021-4378 - CVE House

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Status published Medium CVE-2021-4378

WP Quick FrontEnd Editor <= 5.5 - Authenticated (Subscriber+) Stored Cross-Site Scripting

6.4 CVSS

Vulnerability Description

The WP Quick FrontEnd Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 5.5 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with minimal permissions like subscribers, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

Jerome Bruandet

References

More from labibahmed42

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3D Photo Gallery <= 1.3 - Missing Authorization to Authenticated (Subscriber+) Stored Cross-Site Scripting

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Team Builder For WPBakery Page Builder(Formerly Visual Composer) <= 1.0 - Authenticated (Contributor+) Stored Cross-Site Scripting

Simple Pricing Tables For WPBakery Page Builder(Formerly Visual Composer) <= 1.0 - Authenticated (Contributor+) Stored Cross-Site Scripting

Affected Vendor

labibahmed42

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Affected Software

WP Quick FrontEnd Editor – WordPress Plugin

Vulnerable Versions:

0

Timeline

Official Publish: June 7th, 2023

Last Modified: April 8th, 2026

Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Weaknesses (CWE)

MITRE ATT&CK TTPs

T1189 Drive-by Compromise

T1059.007 JavaScript

T1539 Steal Web Session Cookie

T1213 Data from Information Repositories

T1567 Exfiltration Over Web Service

T1491.001 Defacement