CVE-2023-4158Network attack vector

Stored script execution via extension-unchecked asset uploads

Published Aug 4, 2023 · Updated Oct 9, 2024

Stored cross-site scripting in Omeka S before 4.0.3 allows remote authenticated users to execute script through a crafted asset upload. AssetAdapter validated an upload's declared media type but passed no filename-extension allowlist, permitting scriptable files with an accepted type to be stored. Execution requires another user to open the uploaded asset, exposing browser-accessible data or actions in that user's session.

CVSS severity6.4
Medium
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Omeka S before 4.0.3 allows remote authenticated users to execute script through a crafted asset upload. AssetAdapter validated an upload's declared media type but passed no filename-extension allowlist, permitting scriptable files with an accepted type to be stored. Execution requires another user to open the uploaded asset, exposing browser-accessible data or actions in that user's session.

The record

CVE
CVE-2023-4158
Published
Aug 4, 2023
Updated
Oct 9, 2024
Vendor
Omeka
Product
Omeka S
Classifications
CWE-79, T1059.007
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=unspecified <4.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Omeka · Omeka Sversion=unspecified <4.0.3
Omeka · Omeka Classicversion=0 <4.0.3

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
6.4huntr.devCVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

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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