{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-86326", "assignerOrgId": "2e0a0ee2-d866-482a-9f5e-ac03d156dbaa", "state": "PUBLISHED", "assignerShortName": "Moxa", "dateReserved": "2026-09-07T06:34:04.814Z", "datePublished": "2026-10-02T10:21:56.863Z", "dateUpdated": "2026-10-02T10:39:59.785Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "2e0a0ee2-d866-482a-9f5e-ac03d156dbaa", "shortName": "Moxa", "dateUpdated": "2026-10-02T10:21:56.863Z"}, "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-347", "description": "CWE-347: Improper Verification of Cryptographic Signature", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-475", "descriptions": [{"lang": "en", "value": "CAPEC-475: Signature Spoofing by Improper Validation"}]}], "affected": [{"vendor": "Moxa", "product": "MGate MB3170 Series", "versions": [{"status": "affected", "version": "1.0"}], "defaultStatus": "unaffected"}, {"vendor": "Moxa", "product": "MGate MB3270 Series", "versions": [{"status": "affected", "version": "1.0"}], "defaultStatus": "unaffected"}], "cpeApplicability": [{"operator": "OR", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:moxa:mgate_mb3170_series:1.0:*:*:*:*:*:*:*"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:moxa:mgate_mb3270_series:1.0:*:*:*:*:*:*:*"}]}]}], "descriptions": [{"lang": "en", "value": "An improper verification of cryptographic signature vulnerability exists in protocol gateways\u00a0because the device does not properly verify the cryptographic authenticity of firmware images before installation. An attacker with high privileges and access to the firmware update interface could provide a specially crafted or modified firmware image, causing it to be installed on the device. Successful exploitation could allow the attacker to execute unauthorized code, compromise the integrity and availability of the device, and persist malicious modifications across subsequent firmware updates.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "An improper verification of cryptographic signature vulnerability exists in protocol gateways&nbsp;because the device does not properly verify the cryptographic authenticity of firmware images before installation. An attacker with high privileges and access to the firmware update interface could provide a specially crafted or modified firmware image, causing it to be installed on the device. Successful exploitation could allow the attacker to execute unauthorized code, compromise the integrity and availability of the device, and persist malicious modifications across subsequent firmware updates."}]}], "references": [{"url": "https://www.moxa.com/en/support/product-support/security-advisory/mpsa-269540-cve-2026-86325,-cve-2026-86326-two-vulnerabilities-in-protocol-gateways", "tags": ["vendor-advisory"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 8.6, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}}], "solutions": [{"lang": "en", "value": "Users are advised to follow the applicable Security Hardening Guide for the MGate MB3000 or MGate 5000 Series when obtaining and updating firmware. The guides provide recommendations for securely obtaining firmware from official Moxa sources and performing firmware updates. Users should follow the applicable guidance to ensure that the correct and trusted firmware is obtained and that firmware updates are performed securely. For detailed mitigation guidance, please refer to the following Security Hardening Guides: * The Security Hardening Guide for the MGate 5000 Series\n * The Security Hardening Guide for the MGate MB3000 Series", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<span>Users are advised to follow the applicable Security Hardening Guide for the MGate MB3000 or MGate 5000 Series when obtaining and updating firmware. The guides provide recommendations for securely obtaining firmware from official Moxa sources and performing firmware updates. Users should follow the applicable guidance to ensure that the correct and trusted firmware is obtained and that firmware updates are performed securely. For detailed mitigation guidance, please refer to the following Security Hardening Guides:</span><ul><li>The Security Hardening Guide for the MGate 5000 Series</li><li>The Security Hardening Guide for the MGate MB3000 Series</li></ul>"}]}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-02T10:37:09.559538Z", "id": "CVE-2026-86326", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-02T10:39:59.785Z"}}]}}

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