# CVE-2026-80156: Lantronix SLC8000/SLC9000/EMG series path traversal RCE in web upload

Source: https://junglewise.ai/threats/cve-2026-80156-lantronix-slc8000-before-firmware-v9-7-0-5-slc9000-before  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-22. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-80156 · Severity: critical · CVSS 9.1 · Published 2026-09-22

Lantronix out-of-band management devices used in data centers, telecom networks, and government infrastructure contain a path traversal vulnerability in their web management portal. An authenticated attacker can bypass filename validation to write arbitrary files anywhere on the device, achieving complete remote code execution. This could allow takeover of critical infrastructure management systems and downstream serial-connected devices.

Technologies: [Lantronix EMG7500](https://junglewise.ai/threats/technologies/emg7500), [Lantronix EMG8500](https://junglewise.ai/threats/technologies/emg8500), [Lantronix SLB882](https://junglewise.ai/threats/technologies/slb882), [Lantronix SLC8000](https://junglewise.ai/threats/technologies/slc8000), [Lantronix SLC9000](https://junglewise.ai/threats/technologies/slc9000), [Lantronix SLCx-02](https://junglewise.ai/threats/technologies/slcx-02), [Lantronix SLCx-03](https://junglewise.ai/threats/technologies/slcx-03). Vendors: [Lantronix](https://junglewise.ai/threats/vendors/lantronix).

## Quick answers

**Is CVE-2026-80156 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-80156 being exploited in the wild.

**How severe is CVE-2026-80156?** Critical severity, with a CVSS score of 9.1, published 22 September 2026.

**Which products and versions are affected?** Lantronix EMG7500 before v9.7.0.1; Lantronix EMG8500 before v9.7.0.1; Lantronix SLB882 all versions; Lantronix SLC8000 before v9.7.0.5; and 3 more.

**Is there a fix for CVE-2026-80156?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-80156 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-80156?** Check whether you run Lantronix EMG7500, Lantronix EMG8500, Lantronix SLB882 or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The web management portal's upload endpoint strips backslash characters but does not validate forward slashes afterward; an attacker providing a filename with both characters can write arbitrary files outside the intended directory. Exploitation requires authentication and network access to the management portal. Successful exploitation grants complete arbitrary code execution on the affected device with full confidentiality, integrity, and availability compromise.

## Affected products

- Lantronix SLC8000 before v9.7.0.5
- Lantronix SLC9000 before v9.7.0.2
- Lantronix EMG8500 before v9.7.0.1
- Lantronix EMG7500 before v9.7.0.1
- Lantronix SLB882 all versions
- Lantronix SLCx-03 all versions
- Lantronix SLCx-02 all versions

## Timeline

- 2026-09-22: disclosed: CVE-2026-80156 published

## References

- [https://revrb.net/2026/09/21/revrb-lantern.html](https://revrb.net/2026/09/21/revrb-lantern.html)
- [https://ts.lantronix.com/ftp/SLC9000/9.7.0.2R1/](https://ts.lantronix.com/ftp/SLC9000/9.7.0.2R1/)

## Related threats

- [Lantronix SLC8000 SLC9000 EMG authentication bypass in web management portal](https://junglewise.ai/threats/cve-2026-80155-lantronix-slc8000-before-firmware-v9-7-0-5-slc9000-before)
- [Lantronix Autonomous Out-of-Band Devices authentication bypass in web management](https://junglewise.ai/threats/cve-2026-80154-all-firmware-versions-of-lantronix-slc8000-slc9000-emg8500)
- [Lantronix Autonomous Out-of-Band Device command injection in CLI](https://junglewise.ai/threats/cve-2026-80152-lantronix-slc8000-before-firmware-v9-7-0-3-slc9000-before)
- [Lantronix out-of-band management devices command injection in NFS download](https://junglewise.ai/threats/cve-2026-80151-lantronix-slc8000-before-firmware-v9-7-0-3-slc9000-before)
- [Lantronix SLC/EMG/SLB out-of-band management server-side request forgery](https://junglewise.ai/threats/cve-2026-80150-lantronix-slc8000-before-firmware-v9-7-0-3-slc9000-before)