CVE-2021-24236Public exploitNetwork attack vector

Unauthenticated code execution via spoofed upload type

Published May 5, 2021 · Updated Aug 3, 2024

Arbitrary file upload in williewonka Imagements 1.2.5 and earlier allows remote attackers to execute PHP code through comments. The imagements_verify_post_data() function trusts the client-controlled image MIME type, while imagements_formverwerking() saves the original filename into a web-accessible images directory. No authentication is required; a forged image Content-Type paired with a PHP filename bypasses validation and enables code execution as the web server.

CVSS severity9.8
Critical
EPSS probability7.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file upload in williewonka Imagements 1.2.5 and earlier allows remote attackers to execute PHP code through comments. The imagements_verify_post_data() function trusts the client-controlled image MIME type, while imagements_formverwerking() saves the original filename into a web-accessible images directory. No authentication is required; a forged image Content-Type paired with a PHP filename bypasses validation and enables code execution as the web server.

The record

CVE
CVE-2021-24236
Published
May 5, 2021
Updated
Aug 3, 2024
Vendor
williewonka
Product
Imagements
Classifications
CWE-434, T1190, T1505.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 5, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=1.2.5 <=1.2.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

williewonka · Imagementsversion=1.2.5 <=1.2.5

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS: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 exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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