Sharon Brizinov of Claroty reported this vulnerability to Emerson and CISA

Emerson Electric's Proficy Machine Edition Version 9.80 and prior is vulnerable to CWE-29 Path Traversal: '\..\Filename', also known as a ZipSlip attack, through an upload procedure which enables attackers to implant a malicious .BLZ file on the PLC. The

Emerson Electric's Proficy Machine Edition Version 9.00 and prior is vulenrable to CWE-284 Improper Access Control, and stores project data in a directory with improper access control lists.

Emerson Electric's Proficy Machine Edition Version 9.00 and prior is vulenrable to CWE-347 Improper Verification of Cryptographic Signature, and does not properly verify compiled logic (PDT files) and data blocks data (BLD/BLK files).

Emerson Electric's Proficy Machine Edition Version 9.00 and prior is vulnerable to CWE-345 Insufficient Verification of Data Authenticity, and can display logic that is different than the compiled logic.

Emerson Electric's Proficy Machine Edition Version 9.00 and prior is vulenrable to CWE-353 Missing Support for Integrity Check, and has no authentication or authorization of data packets after establishing a connection for the SRTP protocol.