CVE-2023-39377Network attack vector

Dangerous file upload through undisclosed validation failure

Published Sep 26, 2023 · Updated Sep 24, 2024

Unrestricted file upload in Siberian CMS 4.x and 5.x allows remote authenticated administrators to upload dangerous file types. The published record does not identify the upload handler, request parameter, or validation operation that accepts the dangerous file. Administrative access is required, and the disclosed consequence is limited to acceptance of a dangerous file because subsequent storage or execution behavior is not public.

CVSS severity7.2
High
EPSS probability0.83%
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 Siberian CMS 4.x and 5.x allows remote authenticated administrators to upload dangerous file types. The published record does not identify the upload handler, request parameter, or validation operation that accepts the dangerous file. Administrative access is required, and the disclosed consequence is limited to acceptance of a dangerous file because subsequent storage or execution behavior is not public.

The record

CVE
CVE-2023-39377
Published
Sep 26, 2023
Updated
Sep 24, 2024
Vendor
Xtraball
Product
Siberian CMS
Classifications
CWE-434, T1190
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2024Record 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=versions 4.*, 5.* <=upgrade to version 4.20.44 or 5.0.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Xtraball · Siberian CMSversion=versions 4.*, 5.* <=upgrade to version 4.20.44 or 5.0.4

Published CVSS scores

7.2INCDCVSS:3.1/AV:N/AC:L/PR:H/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
Privilegesadmin
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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