CVE-2023-38836Public exploitNetwork attack vector

Authenticated code execution via GIF-header MIME bypass

Published Aug 21, 2023 · Updated Jul 9, 2026

Unrestricted file upload in BoidCMS 2.0.0 allows remote authenticated users to execute arbitrary PHP code through the media uploader. The uploader trusts finfo's MIME result, so a PHP file prefixed with GIF89a is classified as an image and retained with its executable .php extension. An authenticated account with upload access is required; requesting the uploaded file then runs its PHP payload with the web server's privileges.

CVSS severity8.8
High
EPSS probability76.03%
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 BoidCMS 2.0.0 allows remote authenticated users to execute arbitrary PHP code through the media uploader. The uploader trusts finfo's MIME result, so a PHP file prefixed with GIF89a is classified as an image and retained with its executable .php extension. An authenticated account with upload access is required; requesting the uploaded file then runs its PHP payload with the web server's privileges.

The record

CVE
CVE-2023-38836
Published
Aug 21, 2023
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, T1505.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record 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 privilegesauthenticated

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:L/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.

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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
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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