CVE-2026-42458Public exploitNetwork attack vector

Reflected script execution via unescaped files parameter

Published May 15, 2026 · Updated May 15, 2026

Reflected XSS in OpenMage LTS before 20.18.0 allows remote attackers to execute script in an administrator's browser via a crafted run URL. The Mage_Dataflow CSV and Excel XML parsers copy the files route parameter into an import filename without HTML escaping, and the Run Profile page reflects it into HTML. Exploitation requires an authenticated administrator to open the crafted Run Profile URL; injected script can read browser-accessible data or alter the displayed admin page.

CVSS severity5.3
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in OpenMage LTS before 20.18.0 allows remote attackers to execute script in an administrator's browser via a crafted run URL. The Mage_Dataflow CSV and Excel XML parsers copy the files route parameter into an import filename without HTML escaping, and the Run Profile page reflects it into HTML. Exploitation requires an authenticated administrator to open the crafted Run Profile URL; injected script can read browser-accessible data or alter the displayed admin page.

The record

CVE
CVE-2026-42458
Published
May 15, 2026
Updated
May 15, 2026
Vendor
OpenMage
Product
OpenMage LTS
Classifications
CWE-87, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 15, 2026CVE publishedPublication date reported by the CVE source.
  2. May 15, 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=< 20.18.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenMage · OpenMage LTSversion=< 20.18.0

Published CVSS scores

5.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-87Improper Neutralization of Alternate XSS Syntax
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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