CVE-2026-49323

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The WCM derives its response using a reversible, non-cryptographic operation rather than a cryptographic challenge-response, so the persistent immobilizer secret can be reconstructed from one captured exchange. With this secret the attacker can authenticate to the ECM independently of the WCM and start the engine, defeating the immobilizer. Specific protocol details have been withheld pending vendor remediation.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Weak authentication between the Wireless Control Module (WCM) and the Engine Control Module (ECM) of the Indian Motorcycle Scout Bobber + Tech 2025 model year allows an adjacent-network attacker with read access to the in-vehicle network to recover the per-vehicle ECM immobilizer secret by passively observing a single seed/key exchange. The WCM derives its response using a reversible, non-cryptographic operation rather than a cryptographic challenge-response, so the persistent immobilizer secret can be reconstructed from one captured exchange. With this secret the attacker can authenticate to the ECM independently of the WCM and start the engine, defeating the immobilizer. Specific protocol details have been withheld pending vendor remediation.</p>"}]}], "references": [{"url": "https://www.asrg.io/security-advisories/cve-2026-49323-indian-scout-wcm-ecm-weak-authentication", "tags": ["third-party-advisory"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "PHYSICAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE", "baseSeverity": "MEDIUM", "baseScore": 4.3, "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "PHYSICAL", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "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": "MEDIUM", "baseScore": 4.1, "vectorString": "CVSS:4.0/AV:P/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"}}], "solutions": [{"lang": "en", "value": "Replace the non-cryptographic authentication response with HMAC-SHA-256 or ECDSA over a fresh nonce, ECU identifier, and session counter; provision per-vehicle symmetric keys in tamper-resistant secure elements on both authenticating modules.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Replace the non-cryptographic authentication response with HMAC-SHA-256 or ECDSA over a fresh nonce, ECU identifier, and session counter; provision per-vehicle symmetric keys in tamper-resistant secure elements on both authenticating modules.</p>"}]}], "timeline": [{"time": "2025-03-26T00:00:00.000Z", "lang": "en", "value": "Reported to Indian Motorcycle by Rustic Security LLC (responsible disclosure)"}], "credits": [{"lang": "en", "value": "Scott Sheahan, Rustic Security LLC", "type": "finder"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.2"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-29T13:31:09.706928Z", "id": "CVE-2026-49323", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"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": "2026-05-29T13:31:22.823Z"}}]}}

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The WCM derives its response using a reversible, non-cryptographic operation rather than a cryptographic challenge-response, so the persistent immobilizer secret can be reconstructed from one captured exchange. With this secret the attacker can authenticate to the ECM independently of the WCM and start the engine, defeating the immobilizer. 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{"affected": [{"affectedData": [{"defaultStatus": "unknown", "modules": ["Wireless Control Module (WCM)", "Engine Control Module (ECM)"], "platforms": ["OEM Motorcycle"], "product": "Scout Bobber + Tech", "vendor": "Indian Motorcycle", "versions": [{"status": "affected", "version": "2025", "versionType": "model-year"}]}], "source": "cve@asrg.io"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Weak authentication between the Wireless Control Module (WCM) and the Engine Control Module (ECM) of the Indian Motorcycle Scout Bobber + Tech 2025 model year allows an adjacent-network attacker with read access to the in-vehicle network to recover the per-vehicle ECM immobilizer secret by passively observing a single seed/key exchange. The WCM derives its response using a reversible, non-cryptographic operation rather than a cryptographic challenge-response, so the persistent immobilizer secret can be reconstructed from one captured exchange. With this secret the attacker can authenticate to the ECM independently of the WCM and start the engine, defeating the immobilizer. Specific protocol details have been withheld pending vendor remediation."}, {"lang": "es", "value": "Autenticaci\u00f3n d\u00e9bil entre el M\u00f3dulo de Control Inal\u00e1mbrico (WCM) y el M\u00f3dulo de Control del Motor (ECM) del modelo Indian Motorcycle Scout Bobber + Tech 2025 permite a un atacante de red adyacente con acceso de lectura a la red del veh\u00edculo recuperar el secreto del inmovilizador del ECM por veh\u00edculo observando pasivamente un \u00fanico intercambio de semilla/clave. El WCM deriva su respuesta utilizando una operaci\u00f3n reversible y no criptogr\u00e1fica en lugar de un desaf\u00edo-respuesta criptogr\u00e1fico, por lo que el secreto persistente del inmovilizador puede ser reconstruido a partir de un intercambio capturado. Con este secreto, el atacante puede autenticarse en el ECM independientemente del WCM y arrancar el motor, eludiendo el inmovilizador. Los detalles espec\u00edficos del protocolo han sido retenidos a la espera de la remediaci\u00f3n del proveedor."}], "id": "CVE-2026-49323", "lastModified": "2026-07-21T12:10:00.090", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "PHYSICAL", "availabilityImpact": "NONE", "baseScore": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 0.7, "impactScore": 3.6, "source": "cve@asrg.io", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "PHYSICAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 4.1, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:P/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cve@asrg.io", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-49323", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-29T13:31:09.706928Z", "version": "2.0.3"}}]}, "published": "2026-05-29T13:16:23.407", "references": [{"source": "cve@asrg.io", "url": "https://www.asrg.io/security-advisories/cve-2026-49323-indian-scout-wcm-ecm-weak-authentication"}], "sourceIdentifier": "cve@asrg.io", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-327"}, {"lang": "en", "value": "CWE-798"}, {"lang": "en", "value": "CWE-1390"}], "source": "cve@asrg.io", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["oem_motorcycle"], "status": "affected", "versions": {"scheme": "generic", "value": "2025"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "Scout Bobber + Tech", "source": "cna", "vendor": "Indian Motorcycle (Polaris Inc.)"}, "product": "scout_bobber_+_tech", "vendor": "indian_motorcycle"}], "created": "2026-05-29T13:30:44.650042+00:00", "updated": "2026-05-29T15:46:40.506948+00:00", "vendors": ["indian_motorcycle", "indian_motorcycle$PRODUCT$scout_bobber_+_tech"]}