CVE-2020-23572Public exploitNetwork attack vector

Code execution via spoofed image Content-Type

Published Nov 8, 2021 · Updated Aug 4, 2024

Unrestricted file upload in /admin/upload.php in BEESCMS 4.0 allows context-dependent attackers to execute code via a crafted image file. The upload handler checks file size and the client-controlled Content-Type but does not restrict executable filename extensions, so image/jpg permits a PHP file to be stored and requested. Exploitation requires an administrator's authenticated upload interaction and results in execution of the uploaded PHP code on the server.

CVSS severity8.8
High
EPSS probability1.34%
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 /admin/upload.php in BEESCMS 4.0 allows context-dependent attackers to execute code via a crafted image file. The upload handler checks file size and the client-controlled Content-Type but does not restrict executable filename extensions, so image/jpg permits a PHP file to be stored and requested. Exploitation requires an administrator's authenticated upload interaction and results in execution of the uploaded PHP code on the server.

The record

CVE
CVE-2020-23572
Published
Nov 8, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, T1505.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

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 exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1505.003Server Software Component: Web 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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