WBM configuration changes via reflected portSelect script
Published Dec 9, 2025 · Updated Dec 9, 2025
Reflected XSS in Phoenix Contact FL SWITCH and FL NAT firmware before 3.50 allows remote attackers to modify WBM parameters via a crafted link. The port_util.php handler reflects the portSelect query parameter into HTML without neutralizing script markup, causing an authenticated user's browser to execute attacker-supplied code. An authenticated user must follow the link; execution is limited to the WBM context, and the HttpOnly session cookie prevents session theft.
Summary
What happened
Reflected XSS in Phoenix Contact FL SWITCH and FL NAT firmware before 3.50 allows remote attackers to modify WBM parameters via a crafted link. The port_util.php handler reflects the portSelect query parameter into HTML without neutralizing script markup, causing an authenticated user's browser to execute attacker-supplied code. An authenticated user must follow the link; execution is limited to the WBM context, and the HttpOnly session cookie prevents session theft.
The record
- CVE
- CVE-2025-41749
- Published
- Dec 9, 2025
- Updated
- Dec 9, 2025
- Vendor
- Phoenix Contact
- Product
- FL SWITCH 2204-2TC-2SFX
- Classifications
- CWE-79, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 9, 2025CVE publishedPublication date reported by the CVE source.
- Dec 9, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0.0.0 <3.50
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- CyberDanube port_util.php reflected-XSS proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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