CVE-2026-18478Network attack vector

Script execution via unescaped image filenames

Published Aug 10, 2026 · Updated Aug 10, 2026

Stored XSS in Magnolia CMS 6.3.0 through 6.3.9 allows remote authenticated users to execute script in another user's browser. The import workflow stores an image filename containing unneutralized HTML and JavaScript, then renders that name when the uploaded image is opened. Editor privileges are required to upload the crafted image, and a second user's opening of that image triggers script execution in that user's browser context.

CVSS severity5.1
Medium
EPSS probability0.28%
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 Magnolia CMS 6.3.0 through 6.3.9 allows remote authenticated users to execute script in another user's browser. The import workflow stores an image filename containing unneutralized HTML and JavaScript, then renders that name when the uploaded image is opened. Editor privileges are required to upload the crafted image, and a second user's opening of that image triggers script execution in that user's browser context.

The record

CVE
CVE-2026-18478
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
Magnolia
Product
Magnolia CMS
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.3.0 <6.3.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Magnolia · Magnolia CMSversion=6.3.0 <6.3.10

Published CVSS scores

5.1CERT.PLCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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 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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