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Phoenix Contact FL SWITCH 2xxx Series Reflected Cross-Site Scripting Vulnerability

Vulnerability

A reflected cross-site scripting vulnerability has been identified in the web-based management interface of Phoenix Contact FL SWITCH 2xxx series switches, all firmware versions prior to 3.50. This vulnerability allows an unauthenticated remote attacker to deceive an authenticated user into sending a manipulated POST request that alters device configuration parameters accessible through the web management interface. The session cookie is protected with the httpOnly flag, preventing the attacker from hijacking the user's session.

Impact

Exploitation of this vulnerability allows for reflected cross-site scripting, where an attacker can inject malicious scripts that are executed in the context of the user's browser.

Remediation

Users are advised to update to the latest FL SWITCH 2xxx firmware version 3.50, which addresses this vulnerability.

Added: Dec 9, 2025, 7:48 PM
Updated: Dec 9, 2025, 7:48 PM

Vulnerability Rating

Custom Algorithm
spread
4.5
impact
1.0
exploitability
6.0
remediation
7.7
relevance
1.4
threat
0.0
urgency
2.9
incentive
1.7

Our algorithm analyzes dozens of metrics to generate these 8 key vulnerability categories, which are then combined to calculate the overall risk score.