CVE-2021-4354Network attack vector

Authenticated code execution via unchecked ZIP extraction

Published Jun 7, 2023 · Updated Apr 8, 2026

Arbitrary file upload in Magazine3 Technologies PWA for WP 1.7.32 and earlier allows remote authenticated users to execute PHP code. The pwaforwp_splashscreen_uploader AJAX handler copies the request body into a ZIP file and extracts its entries into a web-accessible upload directory without restricting dangerous file types. Subscriber-level access supplies the required nonce, and execution occurs when the server processes an uploaded PHP script.

CVSS severity8.8
High
EPSS probability1.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file upload in Magazine3 Technologies PWA for WP 1.7.32 and earlier allows remote authenticated users to execute PHP code. The pwaforwp_splashscreen_uploader AJAX handler copies the request body into a ZIP file and extracts its entries into a web-accessible upload directory without restricting dangerous file types. Subscriber-level access supplies the required nonce, and execution occurs when the server processes an uploaded PHP script.

The record

CVE
CVE-2021-4354
Published
Jun 7, 2023
Updated
Apr 8, 2026
Vendor
Magazine3 Technologies
Product
PWA for WP
Classifications
CWE-434, T1505.003
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 <=1.7.32

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Magazine3 Technologies · PWA for WPversion=0 <=1.7.32

Published CVSS scores

8.8WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1505.003Server Software Component: Web Shell

Public exploit references

No public exploit references are available in this record.

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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