CVE-2026-49323

Engine-start authorization bypass via reversible seed response

Published May 29, 2026 · Updated May 29, 2026

Weak authentication in 2025 Indian Motorcycle Scout Bobber Limited +Tech allows physically proximate attackers to recover its immobilizer secret. The WCM computes the seed/key response with a reversible, non-cryptographic operation, allowing one captured exchange to reveal the persistent per-vehicle secret. Read access to in-vehicle traffic and observation of an exchange are required; the secret enables independent ECM authentication and engine start.

CVSS severity4.1
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak authentication in 2025 Indian Motorcycle Scout Bobber Limited +Tech allows physically proximate attackers to recover its immobilizer secret. The WCM computes the seed/key response with a reversible, non-cryptographic operation, allowing one captured exchange to reveal the persistent per-vehicle secret. Read access to in-vehicle traffic and observation of an exchange are required; the secret enables independent ECM authentication and engine start.

The record

CVE
CVE-2026-49323
Published
May 29, 2026
Updated
May 29, 2026
Vendor
Indian Motorcycle
Product
Scout Bobber Limited +Tech
Classifications
CWE-327, CWE-1390, CWE-798, CAPEC-97, T0859
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 29, 2026CVE publishedPublication date reported by the CVE source.
  2. May 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2025

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Indian Motorcycle · Scout Bobber Limited +Techversion=2025

Published CVSS scores

4.1Automotive Security Research Group (ASRG)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
4.3Automotive Security Research Group (ASRG)CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-327Use of a Broken or Risky Cryptographic Algorithm
CWE-1390Weak Authentication
CWE-798Use of Hard-coded Credentials
CAPEC-97Cryptanalysis
T0859Valid Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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