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CVE-2026-82827 – Authentication Bypass via Hard-Coded JWT Signing Key – Hitachi Coding Software Suit

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Summary

CVE-2026-82827 is a Use of Hard-Coded Cryptographic Key vulnerability (CWE-321) affecting Hitachi Coding Software Suite (HCSS), a web-based client/server application used to manage industrial coding and marking devices such as printers and vision systems. The software uses a hard-coded secret key to sign JSON Web Tokens (JWTs), which allows a remote, unauthenticated attacker to forge valid Bearer tokens and abuse administrative functions. The issue carries a CVSS v3.1 base score of 9.8 (Critical) and a CVSS v4.0 score of 9.3 (Critical).

Technical details

  • Root cause: HCSS signs authentication Bearer tokens (JWTs) using a cryptographic secret key that is hard-coded into the software rather than generated uniquely per deployment.
  • Trigger conditions: Because the signing key is static and shared across installations, an attacker who obtains or derives this key can craft arbitrary JWTs — including tokens asserting administrative privileges — without needing valid credentials.
  • Attack vector: Network-based (AV:N); no privileges or user interaction are required to exploit the flaw once the hard-coded key is known.
  • Impact: Successful exploitation allows an attacker to generate unauthorized Bearer tokens and invoke administrative functions of HCSS, resulting in a full loss of confidentiality, integrity, and availability for the affected system.

Affected software

  • Hitachi Coding Software Suite: through V3.3.0 (all versions up to and including V3.3.0)

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • CVSS v4.0 Score: 9.3 (Critical) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Upgrade Hitachi Coding Software Suite to V4.0.0 or later, which resolves this vulnerability.
  • If no patch: Hitachi states that no mitigations or workarounds are available for this issue in vendor-supported versions; upgrading is the only remediation path. Until the upgrade is applied, restrict network access to HCSS management interfaces (e.g., via firewalling, VPN, or network segmentation) to trusted administrative hosts only, and monitor for anomalous administrative API activity.

References

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