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.
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
- Sep 9, 2025CVE publishedPublication date reported by the CVE source.
- 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?
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- Affected versionversion=all versions
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- CyberDanube ClientNonce reflected XSS proof of conceptproof of concept · demonstrated
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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