CVE-2026-19471

CVE-2026-19471 describes multiple stored cross-site scripting (XSS) flaws in Rockwell Automation's ArmorStart LT, caused by user-supplied input that is not properly sanitized before being stored on the device. An attacker can inject malicious scripts into stored fields, and those scripts execute in the browser of any user who later views the affected page in the device's interface. Per the CVSS 4.0 vector, the attack is carried out over the network and requires no privileges or user interaction beyond viewing the stored content, but the rated impact is limited (low impact to confidentiality, integrity, and availability), meaning an attacker could typically run scripts in other users' sessions within the product's interface rather than compromise the broader system. Affected users are organizations running ArmorStart LT distributed motor-control units whose management or web interfaces are accessed by operators and engineers. As of now there is no known public proof of concept, the flaw is not in CISA's KEV catalog, and EPSS estimates only a 0.3% chance of exploitation in the next 30 days.

What to do: Monitor the Rockwell Automation security advisory (PSIRT@rockwellautomation.com) for the affected version ranges and fixed firmware, and apply the vendor's update when released. In the meantime, restrict access to ArmorStart LT management interfaces to trusted personnel, limit or avoid browser access to the device UI from untrusted endpoints, and ensure the units are segmented from untrusted networks. Because impact is limited to script execution in users' browsers, standard web-session hygiene and network segmentation substantially reduce risk.