CVE-2023-34007Network attack vector

Authenticated arbitrary file upload via unchecked upload_file

Published Dec 20, 2023 · Updated Apr 28, 2026

Unrestricted file upload in WPChill Download Monitor 4.8.3 and earlier allows remote authenticated users to write arbitrary server files. The AJAX-accessible upload_file function copies attacker-supplied content and its filename into dlm_uploads without file-type validation or an adequate capability check. Subscriber-level access is sufficient, and server-side execution of the uploaded file grants control over site data and service availability.

CVSS severity9.9
Critical
EPSS probability0.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in WPChill Download Monitor 4.8.3 and earlier allows remote authenticated users to write arbitrary server files. The AJAX-accessible upload_file function copies attacker-supplied content and its filename into dlm_uploads without file-type validation or an adequate capability check. Subscriber-level access is sufficient, and server-side execution of the uploaded file grants control over site data and service availability.

The record

CVE
CVE-2023-34007
Published
Dec 20, 2023
Updated
Apr 28, 2026
Vendor
WPChill
Product
Download Monitor
Classifications
CWE-434, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 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=n/a <=4.8.3 changes=[{"at":"4.8.4","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WPChill · Download Monitorversion=n/a <=4.8.3 changes=[{"at":"4.8.4","status":"unaffected"}]

Published CVSS scores

9.9PatchstackCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
8.8NIST NVDCVSS: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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