SSH private-key disclosure via path traversal
Published Sep 16, 2026 · Updated Sep 16, 2026
Path traversal in affected IO-Link masters before 1.7.4 allows remote attackers to read the SSH server's private keys. The /index.php/view_uploaded_iodd_file endpoint accepts traversal sequences in a file request and returns files outside the intended upload directory. No authentication or user interaction is required; disclosure of the server key enables impersonation of the device's SSH service.
Summary
What happened
Path traversal in affected IO-Link masters before 1.7.4 allows remote attackers to read the SSH server's private keys. The /index.php/view_uploaded_iodd_file endpoint accepts traversal sequences in a file request and returns files outside the intended upload directory. No authentication or user interaction is required; disclosure of the server key enables impersonation of the device's SSH service.
The record
- CVE
- CVE-2026-27557
- Published
- Sep 16, 2026
- Updated
- Sep 16, 2026
- Vendor
- Carlo Gavazzi Automation
- Product
- YN115CEI8RPIO
- Classifications
- T1552.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 16, 2026CVE publishedPublication date reported by the CVE source.
- Sep 16, 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=1.0.0 <1.7.4
What conditions does exploitation require?
What is affected?
Published CVSS scores
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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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