CVE-2026-49322: PIN Recovery Vulnerability in Indian Motorcycle Scout Bobber + Tech WCM

Technical summary

CVE-2026-49322 is a weak authentication vulnerability in the Wireless Control Module (WCM) affecting the 2025 model year Indian Motorcycle Scout Bobber + Tech. The vulnerability stems from the use of a non-cryptographic operation in the PIN authentication exchange between the Infotainment Digital Round display and the vehicle's authentication system. An adjacent-network attacker with read access to the in-vehicle CAN bus or wireless network can passively capture a single PIN authentication frame and mathematically derive the user-set unlock PIN through reverse calculation, as the response is deterministically computed rather than derived from a cryptographic challenge-response protocol. This violates fundamental authentication design principles (CWE-294: Authentication Using a Known Password, CWE-327: Use of a Broken or Risky Cryptographic Algorithm, CWE-1390: Weak Authentication).

Business impact

For motorcycle owners, this vulnerability exposes a critical physical security weakness: an attacker with momentary network access (via OBD-II port, vehicle diagnostics tool, or wireless range proximity) can permanently recover the PIN and unlock the vehicle without the owner's knowledge. This increases theft risk, particularly for high-value motorcycles. For Indian Motorcycle and dealers, this represents a product safety and warranty liability issue, potential recall costs, and reputational damage in the premium motorcycle segment. The vulnerability cannot be mitigated by end-users through configuration changes and requires vendor firmware remediation.

Affected systems

Indian Motorcycle Scout Bobber + Tech model year 2025 is the confirmed affected platform. The vulnerability is specific to the Wireless Control Module and Infotainment Digital Round display integration. Verification of model-year boundaries, regional variants, and applicability to other Scout platform variants (such as Scout or Scout Sixty) should be confirmed against the official vendor advisory.

Exploitability

The CVSS v3.1 score of 4.3 (MEDIUM) reflects the requirement for physical or adjacent network proximity (AV:P), low attack complexity (AC:L), no privileges required (PR:N), and user interaction (the owner must attempt a PIN unlock). However, the practical exploitability is notable: once network access is obtained, only a single passive observation is required; no active manipulation is necessary. The attacker does not need to know or guess the PIN beforehand—it is mathematically recoverable in a single transaction. This makes the vulnerability particularly dangerous for vehicles left unattended in public spaces or at service centers.

Remediation

Indian Motorcycle must issue a firmware update for the 2025 Scout Bobber + Tech Wireless Control Module that replaces the non-cryptographic operation with a secure cryptographic challenge-response mechanism. This typically involves a time-based or nonce-based challenge, a keyed HMAC or symmetric cipher for response computation, and secure key derivation. Owners should check for over-the-air (OTA) updates via the Infotainment system or contact authorized Indian Motorcycle dealers for firmware reflash. Until a patch is available, physical security measures (locking the motorcycle in a garage, disabling wireless features if an option exists, or using additional mechanical locks) are the only available mitigations.

Patch guidance

Verify the availability of a firmware update from Indian Motorcycle (official website, dealer notification, or in-vehicle system update prompt). The patch should replace the authentication mechanism in the WCM firmware. Follow the vendor's official patching procedure; do not attempt unauthorized firmware modifications. After patching, test that the PIN unlock mechanism functions normally and confirm the firmware version has been incremented. Check for any interim driver or OBD-II protocol updates that may address related network security posture. Contact an authorized dealer if OTA update is unavailable for your vehicle.

Detection guidance

Network-based detection is limited without decryption keys, but security operations teams managing connected vehicle fleets can: monitor CAN bus traffic for repeated authentication frames during maintenance windows (anomalous unlock attempts), review vehicle diagnostic logs for failed or repeated PIN entries, and implement network segmentation to restrict in-vehicle wireless access to trusted diagnostic tools only. Individual owners cannot easily detect exploitation; however, unexplained PIN resets or unlock events logged in the Infotainment system warrant immediate investigation. Dealer service centers should audit diagnostic tool access logs and restrict OBD-II port physical access.

Why prioritize this

Despite a MEDIUM CVSS score, this vulnerability merits high priority because it directly undermines the primary physical security control of a high-value asset (motorcycle theft prevention). The requirement for only passive observation of a single authentication exchange, combined with the mathematical recoverability of the PIN, makes exploitation trivial once network access is achieved. The vulnerability cannot be worked around by users and affects the core security promise of the product. Organizations managing connected vehicle fleets or high-value motorcycles should escalate awareness and patch planning accordingly.

Risk score, explained

The CVSS 4.3 score is driven primarily by High confidentiality impact (the PIN is compromised) and Medium attack vector (physical/adjacent proximity required). However, the actual security risk is elevated due to the deterministic nature of the vulnerability (one capture yields complete compromise), the lack of user-side workarounds, and the safety implications of vehicle theft. Security leaders should weigh the CVSS score against the business context: for personal motorcycle owners, physical proximity is a practical barrier; for dealerships, fleet operators, or attackers with workshop access, the attack surface is substantially larger.

Frequently asked questions