Vulnerability-Lookup

GHSA-HMCH-26G2-Q5QX

Vulnerability from github – Published: 2026-09-22 18:33 – Updated: 2026-09-22 18:33

Details

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.

Severity

9.1 (Critical)


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

9.4 (Critical)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80156"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-22T16:18:02Z",
    "severity": "CRITICAL"
  },
  "details": "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\u0027s 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.",
  "id": "GHSA-hmch-26g2-q5qx",
  "modified": "2026-09-22T18:33:29Z",
  "published": "2026-09-22T18:33:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80156"
    },
    {
      "type": "WEB",
      "url": "https://revrb.net/2026/09/21/revrb-lantern.html"
    },
    {
      "type": "WEB",
      "url": "https://ts.lantronix.com/ftp/emg/EMG_7500/9.7.0.1R2"
    },
    {
      "type": "WEB",
      "url": "https://ts.lantronix.com/ftp/emg/EMG_8500/9.7.0.1R2"
    },
    {
      "type": "WEB",
      "url": "https://ts.lantronix.com/ftp/slc8000/9.7.0.5R2"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/lantronix-autonomous-out-of-band-devices-arbitrary-file-write-via-upload-filename-validation-bypass"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-80156 (GCVE-0-2026-80156)

Vulnerability from cvelistv5 – Published: 2026-09-22 15:23 – Updated: 2026-09-23 15:42

Title

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

Summary

Severity

9.4 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

9.1 (Critical)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-23 15:42 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

VulnCheck mitre root

References

5 references

URL	Tags
https://revrb.net/2026/09/21/revrb-lantern.html	technical-description
https://ts.lantronix.com/ftp/slc8000/9.7.0.5R2/	patch
https://ts.lantronix.com/ftp/emg/EMG_8500/9.7.0.1R2/	patch
https://ts.lantronix.com/ftp/emg/EMG_7500/9.7.0.1R2/	patch
https://www.vulncheck.com/advisories/lantronix-au…	third-party-advisory

Impacted products

6 products

Vendor	Product	Version
LANTRONIX	SLC8000	Affected: 0 , < 9.7.0.5 (custom)
LANTRONIX	EMG8500	Affected: 0 , < 9.7.0.1 (custom)
LANTRONIX	EMG7500	Affected: 0 , < 9.7.0.1 (custom)
LANTRONIX	SLB882	Affected: * (custom)
LANTRONIX	SLCx-03	Affected: * (custom)
LANTRONIX	SLCx-02	Affected: * (custom)

Date Public

2026-09-18 00:00

Credits

RE/VRb

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
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        "metrics": [
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                "id": "CVE-2026-80156",
                "options": [
                  {
                    "Exploitation": "none"
                  },
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                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-23T15:42:01.037508Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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    "cna": {
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          "vendor": "LANTRONIX",
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              "status": "affected",
              "version": "0",
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            }
          ]
        },
        {
          "defaultStatus": "unknown",
          "product": "SLB882",
          "vendor": "LANTRONIX",
          "versions": [
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          ]
        },
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        }
      ],
      "metrics": [
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            "baseScore": 9.4,
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            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "HIGH",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
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          ]
        },
        {
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            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
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          "format": "CVSS",
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          "tags": [
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        },
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          "tags": [
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          ],
          "url": "https://ts.lantronix.com/ftp/slc8000/9.7.0.5R2/"
        },
        {
          "name": "EMG8500 Firmware",
          "tags": [
            "patch"
          ],
          "url": "https://ts.lantronix.com/ftp/emg/EMG_8500/9.7.0.1R2/"
        },
        {
          "name": "EMG7500 Firmware",
          "tags": [
            "patch"
          ],
          "url": "https://ts.lantronix.com/ftp/emg/EMG_7500/9.7.0.1R2/"
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    "dateReserved": "2026-08-25T20:43:54.262Z",
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    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-HMCH-26G2-Q5QX

CVE-2026-80156 (GCVE-0-2026-80156)

Tags

Sightings

Nomenclature

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