CVE-2025-4326Public exploitNetwork attack vector

Stored script execution via unencoded fragment output

Published May 6, 2025 · Updated May 6, 2025

Stored cross-site scripting in MRCMS 3.1.2 allows remote authenticated users to persist script content through the Add Fragment page. The /admin/chip/add.do handler accepts front-end data that is later returned without input filtering or HTML entity encoding. Administrative access is required to store the payload, and execution occurs when another user views the affected page content.

CVSS severity5.4
Medium
EPSS probability0.31%
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 MRCMS 3.1.2 allows remote authenticated users to persist script content through the Add Fragment page. The /admin/chip/add.do handler accepts front-end data that is later returned without input filtering or HTML entity encoding. Administrative access is required to store the payload, and execution occurs when another user views the affected page content.

The record

CVE
CVE-2025-4326
Published
May 6, 2025
Updated
May 6, 2025
Vendor
Marker
Product
MRCMS
Classifications
CWE-79, CWE-94, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 6, 2025CVE publishedPublication date reported by the CVE source.
  2. May 6, 2025Record 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=3.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Marker · MRCMSversion=3.1.2

Published CVSS scores

4.8VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
3.3VulDBAV:N/AC:L/Au:M/C:N/I:P/A:N
5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
2.4VulDBCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.007JavaScript/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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