Summary
Schneider Electric is aware of a vulnerability in its Modicon Controllers M241 / M251, M258, and LMC058
products.
The [Modicon Controllers M241 / M251 / M258](https://www.se.com/ww/en/product-category/3900-plc-pac-and-dedicated-controllers/) and [Modicon LMC058](https://www.se.com/ww/en/product-range/7744-modicon-lmc058/) are Programmable Logic Controllers for
performance-demanding applications.
Failure to apply the remediation or mitigations provided below may risk a Cross-site Scripting or an open
redirect attack which could result in an account takeover scenario or the execution of code in the user browser.
Vulnerabilities 1
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Medium 5.1
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability exists that c…
Revision history
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#2
Initial CISA Republication of Schneider Electric CPCERT SEVD-2026-069-02 advisory
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#1
Original Release
References
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Improper Neutralization in Multiple Products - SEVD-2026-069-02 PDF Version
https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2026-069-02&p_enDocType=Security+and+Safety+Notice&p_File_Name=SEVD-2026-069-02.pdf
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Recommended Cybersecurity Best Practices
https://www.se.com/ww/en/download/document/7EN52-0390/
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ICS Advisory ICSA-26-078-02 - Web Version
https://www.cisa.gov/news-events/ics-advisories/icsa-26-078-02
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Recommended Practices
https://www.cisa.gov/news-events/ics-alerts/ics-alert-10-301-01
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Recommended Practices
https://www.cisa.gov/resources-tools/resources/ics-recommended-practices
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Recommended Practices
https://www.cisa.gov/topics/industrial-control-systems
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Recommended Practices
https://www.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
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Recommended Practices
https://www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf
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Recommended Practices
https://www.cisa.gov/news-events/news/targeted-cyber-intrusion-detection-and-mitigation-strategies-update-b