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    "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 → 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 — so an unauthenticated network caller can reach the Arkime backend while supplying a forged, auto-provisioned identity.",
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                            "value": "Malcolm's front nginx reverse proxy defines a \"Dashboards → 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 — 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"
                }
            ],
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                {
                    "format": "CVSS",
                    "scenarios": [
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                            "lang": "en",
                            "value": "GENERAL"
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                    ],
                    "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": {
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        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-10-08T19:07:14.526487Z",
                                "id": "CVE-2026-107336",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
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                                        "Automatable": "yes"
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                                        "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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        ]
    }
}