CVE-2023-37611Public exploitNetwork attack vector

Stored XSS via unchecked SVG asset links

Published Sep 18, 2023 · Updated Aug 2, 2024

Stored XSS in Neos CMS 8.3.3 allows remote authenticated users to execute script in another user's browser through a crafted SVG. The media browser exposes an uploaded SVG through assetProxy.originalUri without first checking its content, so embedded script runs when the asset is opened. Exploitation requires permission to upload the file or coercion of a permitted user, and a media-authorized victim must open the asset in a browser that permits its script.

CVSS severity5.4
Medium
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Neos CMS 8.3.3 allows remote authenticated users to execute script in another user's browser through a crafted SVG. The media browser exposes an uploaded SVG through assetProxy.originalUri without first checking its content, so embedded script runs when the asset is opened. Exploitation requires permission to upload the file or coercion of a permitted user, and a media-authorized victim must open the asset in a browser that permits its script.

The record

CVE
CVE-2023-37611
Published
Sep 18, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.4GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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