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.

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Advisories

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Fixes

Solution

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.


Workaround

No workaround given by the vendor.

History

Fri, 29 May 2026 16:00:00 +0000

Type Values Removed Values Added
First Time appeared Indian Motorcycle
Indian Motorcycle scout Bobber + Tech
Vendors & Products Indian Motorcycle
Indian Motorcycle scout Bobber + Tech

Fri, 29 May 2026 15:30:00 +0000

Type Values Removed Values Added
References

Fri, 29 May 2026 14:45:00 +0000


Fri, 29 May 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 29 May 2026 12:45:00 +0000

Type Values Removed Values Added
Description 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.
Title Indian Scout Bobber 2025 WCM-to-ECM weak authentication
Weaknesses CWE-1390
CWE-327
CWE-798
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 4.1, 'vector': '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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: ASRG

Published:

Updated: 2026-05-29T13:44:56.770Z

Reserved: 2026-05-29T07:26:43.199Z

Link: CVE-2026-49323

cve-icon Vulnrichment

Updated: 2026-05-29T13:31:14.323Z

cve-icon NVD

Status : Deferred

Published: 2026-05-29T13:16:23.407

Modified: 2026-05-29T15:16:24.630

Link: CVE-2026-49323

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-29T15:46:40Z

Weaknesses