---
title: "CVE-2026-80154: Lantronix - Authentication Bypass"
description: "Lantronix SLC8000, EMG8500, EMG7500, SLB882, SLCx-03, and SLCx-02 firmware contain an authentication bypass caused by predictable session token generation and crafted URI exploiting file extension handling in web management portal, letting unauthenticated attackers bypass source IP and User-Agent validation to gain elevated privileges."
url: https://panop.io/threat-heartbeat/CVE-2026-80154/
---

# CVE-2026-80154 Lantronix - Authentication Bypass

Lantronix SLC8000, EMG8500, EMG7500, SLB882, SLCx-03, and SLCx-02 firmware contain an authentication bypass caused by predictable session token generation and crafted URI exploiting file extension handling in web management portal, letting unauthenticated attackers bypass source IP and User-Agent validation to gain elevated privileges.

CVSS base score 9.6 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.63% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-80154)

## Details

Type

Authentication Bypass

Impact

Broken Authentication, Privilege Escalation

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Published

22 September 2026

Updated

15 October 2026

Weakness

[CWE-330](https://cwe.mitre.org/data/definitions/330.html)

## Vendor fix

Update to the latest firmware version provided by Lantronix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-80154](https://nvd.nist.gov/vuln/detail/CVE-2026-80154)
- [https://revrb.net/2026/09/21/revrb-lantern.html](https://revrb.net/2026/09/21/revrb-lantern.html)
- [https://www.vulncheck.com/advisories/lantronix-autonomous-out-of-band-devices-predictable-session-token-with-validation-bypass](https://www.vulncheck.com/advisories/lantronix-autonomous-out-of-band-devices-predictable-session-token-with-validation-bypass)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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