[Control Systems] Phoenix Contact Security Advisory (AV26-247)

Serial number: AV26-247
Date: March 18, 2026

On March 18, 2026, Phoenix Contact published a security advisory to address vulnerabilities in the following products:

• FL SWITCH 2xxx – 3.50 firmware versions prior to 3.53
• FL SWITCH TSN 23xx – 3.50 firmware versions prior to 3.53
• FL SWITCH 59xx – 3.50 firmware versions prior to 3.53

The Cyber Centre encourages users and administrators to review the provided web links and apply the necessary updates.

• VDE-2025-104: Phoenix Contact: Multiple Vulnerabilities in FL SWITCH 2xxx, FL SWITCH TSN 23xx and FL SWITCH 59xx Firmware (PDF)
• Phoenix Contact Security Advisories