CVE-2023-4666Known exploitationPublic exploitNetwork attack vector

Remote code execution via unvalidated signature upload

Published Oct 16, 2023 · Updated Apr 23, 2025

Unrestricted file upload in 10Web Form Maker before 1.15.20 allows remote attackers to execute code through a crafted signature field. In the type_signature branch of save_db(), the plugin writes user-supplied signature content without validating the resulting file type. No authentication is required, and impact reaches code execution when the web server processes the uploaded dangerous file.

CVSS severity9.8
Critical
EPSS probability3.28%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in 10Web Form Maker before 1.15.20 allows remote attackers to execute code through a crafted signature field. In the type_signature branch of save_db(), the plugin writes user-supplied signature content without validating the resulting file type. No authentication is required, and impact reaches code execution when the web server processes the uploaded dangerous file.

The record

CVE
CVE-2023-4666
Published
Oct 16, 2023
Updated
Apr 23, 2025
Vendor
10Web
Product
Form Maker by 10Web
Classifications
CWE-434, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record 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 <1.15.20

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

10Web · Form Maker by 10Webversion=0 <1.15.20

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8CISA-ADPCVSS: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 exploitationReported
Public exploitPublished

Weakness, pattern, technique

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

Public exploit references

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

Reported exploitation

Technologies

Your stack

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Your stack

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