Indian Scout Bobber 2025 WCM-to-ECM weak authentication
Summary
| CVE | CVE-2026-49323 |
|---|---|
| State | PUBLISHED |
| Assigner | ASRG |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-29 13:16:23 UTC |
| Updated | 2026-05-29 13:16:23 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 4.1 MEDIUM from [email protected]
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
Problem Types: CWE-327 | CWE-798 | CWE-1390 | CWE-1390 CWE-1390 Weak Authentication | CWE-327 CWE-327 Use of a Broken or Risky Cryptographic Algorithm | CWE-798 CWE-798 Use of Hard-coded Credentials
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 4.1 | MEDIUM | 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/C... |
| 4.0 | CNA | CVSS | 4.1 | MEDIUM | 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 |
| 3.1 | [email protected] | Secondary | 4.3 | MEDIUM | CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N |
| 3.1 | CNA | CVSS | 4.3 | MEDIUM | CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N |
CVSS v4.0 Breakdown
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
CVSS v3.1 Breakdown
CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Indian Motorcycle Polaris Inc. | Scout Bobber Tech | affected 2025 model-year | OEM Motorcycle |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| cwe.mitre.org/data/definitions/1390.html | [email protected] | cwe.mitre.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Scott Sheahan, Rustic Security LLC (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2025-03-26T00:00:00.000Z | Reported to Indian Motorcycle by Rustic Security LLC (responsible disclosure) |
Solutions
CNA: 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.