CVE-2025-7746Public exploitNetwork attack vector

Session hijacking via reflected ClientNonce script injection

Published Sep 9, 2025 · Updated Nov 3, 2025

Reflected cross-site scripting in Schneider Electric Altivar web interfaces allows remote attackers to read or modify browser data. The device web server reflects an unvalidated ClientNonce value during logon without filtering, allowing injected JavaScript in GET or POST responses. Exploitation requires a victim to visit attacker-controlled content, after which the script can hijack the victim's device-management session.

CVSS severity5.3
Medium
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected cross-site scripting in Schneider Electric Altivar web interfaces allows remote attackers to read or modify browser data. The device web server reflects an unvalidated ClientNonce value during logon without filtering, allowing injected JavaScript in GET or POST responses. Exploitation requires a victim to visit attacker-controlled content, after which the script can hijack the victim's device-management session.

The record

CVE
CVE-2025-7746
Published
Sep 9, 2025
Updated
Nov 3, 2025
Vendor
Distributed Data Systems
Product
Altivar Machine ATV340E
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 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=all versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Distributed Data Systems · Altivar Machine ATV340Eversion=all versions
Distributed Data Systems · Altivar Process ATV6000version=all versions
Distributed Data Systems · Altivar Soft Starter ATS490version=all versions
Distributed Data Systems · ATV dPAC moduleversion=all versions <v25.0
Distributed Data Systems · Altivar Process ATV900version=all versions
Distributed Data Systems · Altivar Process ATV600version=all versions
Distributed Data Systems · ILC992 InterLink Converterversion=all versions
Distributed Data Systems · Altivar Process Communication Modules VW3A3720 and VW3A3721version=all versions

Published CVSS scores

5.3Schneider Electric SECVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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