CVE-2025-53858Network attack vector

Browser script execution via Chat Room content

Published Oct 16, 2025 · Updated Oct 16, 2025

Cross-site scripting in NEOJAPAN ChatLuck V6.6 R2.0 and earlier allows remote authenticated users to run scripts in users' browsers. The vendor identifies Chat Rooms as the affected locus but withholds the input field, storage path, and faulty output-handling operation. A ChatLuck user must register the script, and another logged-in user must access the affected content; execution remains confined to that user's browser.

CVSS severity4.8
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in NEOJAPAN ChatLuck V6.6 R2.0 and earlier allows remote authenticated users to run scripts in users' browsers. The vendor identifies Chat Rooms as the affected locus but withholds the input field, storage path, and faulty output-handling operation. A ChatLuck user must register the script, and another logged-in user must access the affected content; execution remains confined to that user's browser.

The record

CVE
CVE-2025-53858
Published
Oct 16, 2025
Updated
Oct 16, 2025
Vendor
NEOJAPAN Inc.
Product
ChatLuck
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 16, 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=V6.6 R2.0 and earlier

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

NEOJAPAN Inc. · ChatLuckversion=V6.6 R2.0 and earlier

Published CVSS scores

4.8JVNCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
5.4JVNCVSS:3.0/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
T1059.007Command and Scripting Interpreter: JavaScript/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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