ICS Patch Tuesday: New Security Advisories From Siemens, Schneider, CISA

Only Siemens, Schneider Electric, CISA, and CERT@VDE have published new ICS security advisories for the May 2026 Patch Tuesday.  Siemens has published 18 new security advisories, and several of them describe critical vulnerabilities.  The company has addressed critical issues in Sentron 7KT PAC1261 Data Manager (device takeover), Simatic S7 PLC web server (XSS), Ruggedcom Rox (command execution as root, old vulnerabilities in third-party components), ROS# (arbitrary file access), Simatic CN4100 (over 300 third-party component flaws), and Opcenter RDnL (missing authentication). Siemens has also informed customers that its Ruggedcom APE1808 product is affected by the recently disclosed Palo Alto Networks PAN-OS vulnerability that has been exploited in the wild, possibly by Chinese state-sponsored hackers.  High-severity vulnerabilities that can be exploited for remote code execution have been resolved in Simcenter Femap, Teamcenter, gPROMS Web Applications Publisher, and Ruggedcom Rox. A high-severity flaw in KACO Blueplanet inverters can lead to information disclosure, and users have been informed about a control panel escape issue affecting Simatic HMI Unified Comfort. Schneider Electric has published four new advisories. Three of them address high-severity vulnerabilities in EcoStruxure Panel Server (sensitive information exposure), EasyLogic T150 and Saitel DP RTU (unauthorized file access), and EasyLogic, PowerLogic, Easergy, and EcoStruxure products (session hijacking). A medium-severity information disclosure flaw has been patched in Ecostruxure Machine Expert HVAC. CISA has published advisories for several ABB product vulnerabilities over the past two weeks. On Patch Tuesday, it also released advisories for security holes found in products from Subnet Solutions, Fuji Electric, Maxhub, and Johnson Controls.  Germany’s CERT@VDE published a new advisory to describe a medium-severity DoS flaw in Codesys Modbus.  Related: Polish Security Agency Reports ICS Breaches at Five Water Treatment Plants Related: CISA Launches ‘CI Fortify’ to Prepare Critical Infrastructure for Geopolitical Cyber Conflict Related: EnOcean SmartServer Flaws Expose Buildings to Remote Hacking Related: Hundreds of Internet-Facing VNC Servers Expose ICS/OT WRITTEN BY Eduard Kovacs Eduard Kovacs (@EduardKovacs) is senior managing editor at SecurityWeek. He worked as a high school IT teacher before starting a career in journalism in 2011. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering. 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