CVE-2023-51475Network attack vector

Unauthenticated code execution via dangerous file upload

Published Dec 29, 2023 · Updated Apr 28, 2026

Unrestricted file upload in IOSS WP MLM SOFTWARE PLUGIN 4.0 and earlier allows remote attackers to upload executable files. Public sources identify only a failure to restrict dangerous upload types and do not disclose the affected handler or validation routine. No authentication or user interaction is required, and an uploaded backdoor can execute in the WordPress site's context, enabling site compromise.

CVSS severity10.0
Critical
EPSS probability0.56%
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 IOSS WP MLM SOFTWARE PLUGIN 4.0 and earlier allows remote attackers to upload executable files. Public sources identify only a failure to restrict dangerous upload types and do not disclose the affected handler or validation routine. No authentication or user interaction is required, and an uploaded backdoor can execute in the WordPress site's context, enabling site compromise.

The record

CVE
CVE-2023-51475
Published
Dec 29, 2023
Updated
Apr 28, 2026
Vendor
IOSS
Product
WP MLM SOFTWARE PLUGIN
Classifications
CWE-434, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 29, 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 <=4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IOSS · WP MLM SOFTWARE PLUGINversion=n/a <=4.0

Published CVSS scores

10.0PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
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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