Hitachi Coding Software Suite: Hard-coded JWT signing key allows forged admin tokens
Summary
Hitachi Coding Software Suite (HCSS), software for centrally controlling and monitoring marking and coding devices, uses a hard-coded secret key to sign JSON Web Tokens (JWT). An attacker who knows this key can generate valid Bearer tokens without logging in and use administrative functions. Exploitation requires network access to the HCSS web interface; no privileges or user interaction are needed. The vendor reports no workarounds, so the fix is an upgrade.
Affected
- Hitachi Coding Software Suite V3.3.0 and earlier (vendor advisory)
- Default configuration: unaffected according to the CNA record
Fixed in
- Upgrade to Hitachi Coding Software Suite V4.0.0 (vendor advisory)
Workaround
- Vendor lists no mitigations or workarounds.
- Interim measure (not vendor-sourced): do not expose HCSS to the internet and restrict access to the web interface to trusted management networks.
Exploitation
- CISA SSVC: Exploitation none, automatable yes, technical impact total.
- Not listed in CISA KEV at the time of research.
- EPSS 0.00268.
- No public proof of concept or exploit found; search was limited.
Our recommendation
- Identify all HCSS installations and their versions.
- Upgrade to V4.0.0 as soon as possible.
- Until the upgrade, remove internet exposure and limit access to trusted hosts only.
- Review administrative accounts and logs for unexpected activity and assume the signing key is compromised until patched.
- Also check the sibling flaws CVE-2026-82825 and CVE-2026-82828 in the same advisory.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Hitachi Coding Software Suite public statement (vendor advisory) www.hitachi-ies.com
- Hitachi acknowledgments www.hitachi.com
- OpenCVE CVE-2026-82827 app.opencve.io
- VulDB CVE-2026-82827 vuldb.com
- Vulnrichment CVE-2026-82827 vulners.com
- Strix CVE-2026-82827 www.strix.ai
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 31 Oct 2026, 03:45.
Original description (NVD)
Hitachi Coding Software Suite contains a vulnerability related to Use of Hard-coded Cryptographic Key. The Hardcoding of JWT signing secret key allows an attacker to generate unauthorized Bearer tokens and exploit administrative functions. This issue affects Hitachi Coding Software Suite: through 3.3.0.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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