{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-107336", "assignerOrgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6", "state": "PUBLISHED", "assignerShortName": "icscert", "dateReserved": "2026-10-07T18:31:15.966Z", "datePublished": "2026-10-08T17:20:46.517Z", "dateUpdated": "2026-10-08T19:07:23.845Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6", "shortName": "icscert", "dateUpdated": "2026-10-08T17:20:46.517Z"}, "title": "Authentication Bypass by Spoofing in Malcolm", "datePublic": "2026-10-07T19:02:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-290", "description": "CWE-290 Authentication bypass by spoofing", "type": "CWE"}]}, {"descriptions": [{"lang": "en", "cweId": "CWE-441", "description": "CWE-441 Unintended Proxy or Intermediary", "type": "CWE"}]}, {"descriptions": [{"lang": "en", "cweId": "CWE-863", "description": "CWE-863 Incorrect Authorization", "type": "CWE"}]}], "affected": [{"vendor": "CISA", "product": "Malcolm", "versions": [{"status": "affected", "version": "0", "lessThanOrEqual": "26.07.1", "versionType": "custom"}, {"status": "unaffected", "version": "26.08.0"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "Malcolm's front nginx reverse proxy defines a \"Dashboards \u2192 Arkime shortcut\" location using a case-insensitive regex matcher but a case-sensitive rewrite. A request whose path segment is not exact-lowercase (for example /IDDASH2ARK/...) enters the location (the matcher fires) but evades the rewrite (no redirect is issued), so nginx falls through to the location's proxy_pass to the Arkime backend. That location is the one proxied location in the shipped config that does not include the per-location authentication file, so the request reaches Arkime unauthenticated. The same location also forwards a client-supplied X-Forwarded-User header un-overwritten, and Arkime is configured to trust X-Forwarded-User as the authenticated username \u2014 so an unauthenticated network caller can reach the Arkime backend while supplying a forged, auto-provisioned identity.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Malcolm's front nginx reverse proxy defines a \"Dashboards \u2192 Arkime shortcut\" location using a <strong>case-insensitive</strong> regex matcher but a <strong>case-sensitive</strong> <code>rewrite</code>. A request whose path segment is not exact-lowercase (for example <code>/IDDASH2ARK/...</code>) enters the location (the matcher fires) but evades the rewrite (no redirect is issued), so nginx falls through to the location's <code>proxy_pass</code> to the Arkime backend. That location is the one proxied location in the shipped config that does <strong>not</strong> include the per-location authentication file, so the request reaches Arkime unauthenticated. The same location also forwards a <strong>client-supplied <code>X-Forwarded-User</code> header un-overwritten</strong>, and Arkime is configured to trust <code>X-Forwarded-User</code> as the authenticated username \u2014 so an unauthenticated network caller can reach the Arkime backend while supplying a forged, auto-provisioned identity."}]}], "references": [{"url": "https://github.com/cisagov/Malcolm/security/advisories/GHSA-7j32-cf27-cp6h", "tags": ["government-resource"]}, {"url": "https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-280-01.json"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE", "baseSeverity": "MEDIUM", "baseScore": 6.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"}}], "solutions": [{"lang": "en", "value": "Update to version v26.08.0", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Update to version v26.08.0"}]}], "credits": [{"lang": "en", "value": "Seth Grover", "type": "finder"}], "source": {"discovery": "INTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-08T19:07:14.526487Z", "id": "CVE-2026-107336", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-08T19:07:23.845Z"}}]}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Malcolm", "vendor": "CISA", "versions": [{"lessThanOrEqual": "26.07.1", "status": "affected", "version": "0", "versionType": "custom"}, {"status": "unaffected", "version": "26.08.0"}]}], "source": "ics-cert@hq.dhs.gov"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Malcolm's front nginx reverse proxy defines a \"Dashboards \u2192 Arkime shortcut\" location using a case-insensitive regex matcher but a case-sensitive rewrite. A request whose path segment is not exact-lowercase (for example /IDDASH2ARK/...) enters the location (the matcher fires) but evades the rewrite (no redirect is issued), so nginx falls through to the location's proxy_pass to the Arkime backend. That location is the one proxied location in the shipped config that does not include the per-location authentication file, so the request reaches Arkime unauthenticated. The same location also forwards a client-supplied X-Forwarded-User header un-overwritten, and Arkime is configured to trust X-Forwarded-User as the authenticated username \u2014 so an unauthenticated network caller can reach the Arkime backend while supplying a forged, auto-provisioned identity."}], "id": "CVE-2026-107336", "lastModified": "2026-10-08T18:17:20.177", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 2.5, "source": "ics-cert@hq.dhs.gov", "type": "Secondary"}]}, "published": "2026-10-08T18:17:20.177", "references": [{"source": "ics-cert@hq.dhs.gov", "url": "https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-280-01.json"}, {"source": "ics-cert@hq.dhs.gov", "url": "https://github.com/cisagov/Malcolm/security/advisories/GHSA-7j32-cf27-cp6h"}], "sourceIdentifier": "ics-cert@hq.dhs.gov", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-290"}, {"lang": "en", "value": "CWE-441"}, {"lang": "en", "value": "CWE-863"}], "source": "ics-cert@hq.dhs.gov", "type": "Primary"}]}

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