CVE-2026-1565Network attack vector

Authenticated file upload via forced JSON typing

Published Feb 26, 2026 · Updated Feb 26, 2026

Arbitrary file upload in weDevs WP User Frontend 4.2.8 and earlier allows remote authenticated users with Author access to write server files. The WPUF_Admin_Settings::check_filetype_and_ext and Admin_Tools::check_filetype_and_ext callbacks replace WordPress file-type results with JSON metadata without validating the uploaded file. Author-level access is required; a server-executable upload grants code execution when the web server permits execution from its destination.

CVSS severity8.8
High
EPSS probability0.55%
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 weDevs WP User Frontend 4.2.8 and earlier allows remote authenticated users with Author access to write server files. The WPUF_Admin_Settings::check_filetype_and_ext and Admin_Tools::check_filetype_and_ext callbacks replace WordPress file-type results with JSON metadata without validating the uploaded file. Author-level access is required; a server-executable upload grants code execution when the web server permits execution from its destination.

The record

CVE
CVE-2026-1565
Published
Feb 26, 2026
Updated
Feb 26, 2026
Vendor
HappyMonster
Product
WP User Frontend
Classifications
CWE-434, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 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=* <=4.2.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

HappyMonster · WP User Frontendversion=* <=4.2.8

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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

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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