CVE-2023-34747Public exploitNetwork attack vector

Arbitrary code execution via unrestricted file upload

Published Jun 14, 2023 · Updated Jan 6, 2025

Unrestricted file upload in UJCMS 6.0.2 allows remote attackers to execute arbitrary code through the backend web-file-upload API. The /api/backend/core/web-file-upload/upload endpoint accepts attacker-controlled files without restricting dangerous file types. No authentication or user interaction is required, and a successfully uploaded server-executable file grants code execution in the server process.

CVSS severity9.8
Critical
EPSS probability20.05%
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 UJCMS 6.0.2 allows remote attackers to execute arbitrary code through the backend web-file-upload API. The /api/backend/core/web-file-upload/upload endpoint accepts attacker-controlled files without restricting dangerous file types. No authentication or user interaction is required, and a successfully uploaded server-executable file grants code execution in the server process.

The record

CVE
CVE-2023-34747
Published
Jun 14, 2023
Updated
Jan 6, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, T1190
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Jun 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 6, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS: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
PrivilegesUnavailable
Known exploitationUnconfirmed
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.

Technologies

Your stack

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Your stack

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