CVE-2017-20063Public exploitNetwork attack vector

Authenticated code execution via incomplete extension blocklist

Published Jun 20, 2022 · Updated Apr 15, 2025

Unrestricted file upload in Elefant CMS before 1.3.13 allows remote authenticated users to execute code through the file manager. The /filemanager/upload/drop handler blocks .php files but accepts other executable PHP extensions, including .php5. Editor or administrator file-management rights are required; a crafted upload can execute server-side PHP or script in a browser.

CVSS severity6.3
Medium
EPSS probability0.86%
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 Elefant CMS before 1.3.13 allows remote authenticated users to execute code through the file manager. The /filemanager/upload/drop handler blocks .php files but accepts other executable PHP extensions, including .php5. Editor or administrator file-management rights are required; a crafted upload can execute server-side PHP or script in a browser.

The record

CVE
CVE-2017-20063
Published
Jun 20, 2022
Updated
Apr 15, 2025
Vendor
HASOMED GmbH
Product
Elefant
Classifications
CWE-434, CWE-269, T1190, T1505.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 20, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 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=1.3.12-RC

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

HASOMED GmbH · Elefantversion=1.3.12-RC

Published CVSS scores

6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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 exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
CWE-269Improper Privilege Management
T1190Exploit Public-Facing Application
T1505.003Web Shell

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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