CVE-2026-80156 Lantronix Autonomous Out-of-Band Devices Arbitrary File Write via Upload Filename Validation Bypass
Authenticated attackers can bypass filename validation to write arbitrary files, leading to remote code execution on Lantronix out-of-band devices.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-80156?
CVE-2026-80156 is a critical path traversal vulnerability in LANTRONIX EMG7500, published on 22 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Lantronix SLC8000 before firmware v9.7.0.5, SLC9000 before firmware v9.7.0.2, EMG8500/EMG7500 before firmware v9.7.0.1, and all firmware versions of SLB882/SLCx-03/SLCx-02 contain a path traversal vulnerability in the web management portal upload endpoint that allows authenticated attackers to write arbitrary data to any location on the device's filesystem, leading to remote code execution. The upload filename validation strips backslash characters but does not subsequently check for forward slashes when a backslash is detected; by supplying a filename containing both characters an attacker writes outside the intended upload directory to any writable path. Attackers can use this vulnerability to achieve complete loss of confidentiality, integrity, and availability on the affected device and potentially impact downstream serial-connected devices.
Weakness: CWE-22
Which versions are affected by CVE-2026-80156?
How do I fix CVE-2026-80156?
No fix has been published for CVE-2026-80156 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-80156 being exploited?
There is no known exploitation of CVE-2026-80156 in the wild and no public exploit code.
Sources
Also known as GHSA-hmch-26g2-q5qx.