Configuration alteration via cross-site Link Aggregation requests
Published Mar 18, 2026 · Updated Mar 18, 2026
CSRF in Phoenix Contact FL SWITCH and FL NAT firmware before 3.53 allows remote attackers to alter Link Aggregation settings. The Link Aggregation web interface accepts state-changing POST requests from an authenticated browser without distinguishing cross-site requests from intentional requests. Exploitation requires an authenticated user to visit an attacker-controlled webpage; configuration and service state can change, but the device automatically recovers from the reported availability effect.
Summary
What happened
CSRF in Phoenix Contact FL SWITCH and FL NAT firmware before 3.53 allows remote attackers to alter Link Aggregation settings. The Link Aggregation web interface accepts state-changing POST requests from an authenticated browser without distinguishing cross-site requests from intentional requests. Exploitation requires an authenticated user to visit an attacker-controlled webpage; configuration and service state can change, but the device automatically recovers from the reported availability effect.
The record
- CVE
- CVE-2026-22323
- Published
- Mar 18, 2026
- Updated
- Mar 18, 2026
- Vendor
- Phoenix Contact
- Product
- FL SWITCH 2204-2TC-2SFX
- Classifications
- CWE-352, T1204.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 18, 2026CVE publishedPublication date reported by the CVE source.
- Mar 18, 2026Record 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 <3.53
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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