CVE-2023-4159Public exploitNetwork attack vector

Dangerous file upload via MIME-only validation

Published Aug 4, 2023 · Updated Oct 9, 2024

Unrestricted file upload in Omeka S before 4.0.3 allows remote authenticated users to store malicious non-image assets over HTTP. AssetAdapter passes only the configured MIME-type allowlist to its file validator, so an approved content type can conceal a dangerous filename extension. Any authenticated role permitted to edit assets can reach the path; impact depends on how the web server handles the stored extension.

CVSS severity8.8
High
EPSS probability1.00%
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 Omeka S before 4.0.3 allows remote authenticated users to store malicious non-image assets over HTTP. AssetAdapter passes only the configured MIME-type allowlist to its file validator, so an approved content type can conceal a dangerous filename extension. Any authenticated role permitted to edit assets can reach the path; impact depends on how the web server handles the stored extension.

The record

CVE
CVE-2023-4159
Published
Aug 4, 2023
Updated
Oct 9, 2024
Vendor
Omeka
Product
Omeka S
Classifications
CWE-434, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 9, 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=0 <4.0.3
  2. Affected versionversion=unspecified <4.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Omeka · Omeka Sversion=0 <4.0.3; version=unspecified <4.0.3

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.9huntr.devCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

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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