An attacker with network access to the affected PLC (CJ-series and CS-series PLCs, all versions) may use a network protocol to read and write files on the PLC internal memory and memory card.
https://www.fa.omron.co.jp/product/security/assets/pdf/en/OMSR-2023-002_en.pdf
https://www.dragos.com/advisory/omron-plc-and-engineering-software-network-and-file-format-access/