CVE-2021-4378Public exploitNetwork attack vector

Subscriber-level stored XSS via unsanitized option values

Published Jun 7, 2023 · Updated Apr 8, 2026

Stored XSS in WP Quick FrontEnd Editor 5.5 and earlier allows remote authenticated users to inject scripts into dashboard toolbar labels. The save_admin_options function passes the la_save_front_editor request directly to update_option, leaving btnText and disBtntext unsanitized. Subscriber-level access is sufficient, and the stored code executes in the browser of any logged-in user who loads the affected toolbar.

CVSS severity6.4
Medium
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in WP Quick FrontEnd Editor 5.5 and earlier allows remote authenticated users to inject scripts into dashboard toolbar labels. The save_admin_options function passes the la_save_front_editor request directly to update_option, leaving btnText and disBtntext unsanitized. Subscriber-level access is sufficient, and the stored code executes in the browser of any logged-in user who loads the affected toolbar.

The record

CVE
CVE-2021-4378
Published
Jun 7, 2023
Updated
Apr 8, 2026
Vendor
Labib Ahmed
Product
WP Quick FrontEnd Editor
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 7, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=5.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Labib Ahmed · WP Quick FrontEnd Editorversion=0 <=5.5

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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