CVE-2026-80156

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-22. a secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Lantronix SLC8000 before firmware v9.7.0.5, 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.

CVSS v3
9.1
EG Score
9.1(high)
EG Risk
41(Track)
EG Risk 41/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
62%
KEV
Not listed

Published

September 22, 2026

Last Modified

September 23, 2026

Advisory Details (5)

Auto-updated Sep 22, 2026
No patch confirmed yet.
generic

Lantronix Autonomous Out-of-Band Devices Arbitrary File Write via Upload Filename Validation Bypass | Advisories | VulnCheck

https://www.vulncheck.com/advisories/lantronix-autonomous-out-of-band-devices-arbitrary-file-write-via-upload-filename-validation-bypass
generic

ts.lantronix.com - /ftp/emg/EMG_7500/9.7.0.1R2/

https://ts.lantronix.com/ftp/emg/EMG_7500/9.7.0.1R2/
generic

ts.lantronix.com - /ftp/emg/EMG_8500/9.7.0.1R2/

https://ts.lantronix.com/ftp/emg/EMG_8500/9.7.0.1R2/
generic

ts.lantronix.com - /ftp/slc8000/9.7.0.5R2/

https://ts.lantronix.com/ftp/slc8000/9.7.0.5R2/
generic

REVRB-LANTERN: Security Research on Lantronix Autonomous Out-of-Band Devices | RE/VRb LLC

https://revrb.net/2026/09/21/revrb-lantern.html

Vendor Advisories for CVE-2026-80156(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 19× in last 7d / 19× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-24 04:31 UTCGHSA enrichment
  2. 2026-09-24 00:27 UTCGHSA enrichment
  3. 2026-09-23 20:24 UTCEG score recompute
  4. 2026-09-23 20:24 UTCGHSA enrichment
  5. 2026-09-23 17:54 UTCEPSS rescore
  6. 2026-09-23 16:19 UTCEG score recompute
  7. 2026-09-23 16:19 UTCGHSA enrichment
  8. 2026-09-23 15:49 UTCEG score recompute
  9. 2026-09-23 15:49 UTCGHSA enrichment
  10. 2026-09-23 12:46 UTCGHSA enrichment
  11. 2026-09-23 08:43 UTCGHSA enrichment
  12. 2026-09-23 04:40 UTCGHSA enrichment
  13. 2026-09-23 00:36 UTCGHSA enrichment
  14. 2026-09-22 20:33 UTCGHSA enrichment
  15. 2026-09-22 20:22 UTCEG score recompute
  16. 2026-09-22 20:22 UTCGHSA enrichment
  17. 2026-09-22 16:19 UTCEG score recompute
  18. 2026-09-22 15:30 UTCEG score recompute
  19. 2026-09-22 15:29 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-80156?
CVE-2026-80156 is a critical vulnerability published on September 22, 2026. Lantronix SLC8000 before firmware v9.7.0.5, 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…
When was CVE-2026-80156 disclosed?
CVE-2026-80156 was first published in the National Vulnerability Database on September 22, 2026, with the most recent update on September 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-80156 actively exploited?
CVE-2026-80156 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 38.1% of all scored CVEs.
What is the CVSS score of CVE-2026-80156?
CVE-2026-80156 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-80156?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-80156, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-80156

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