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CVE-2026-71379 – Unauthenticated Database Export / Information Disclosure – Toptech Systems TMS7 and

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Summary

CVE-2026-71379 is a critical vulnerability (CVSS v3.1 score of 10.0) affecting Toptech Systems’ TMS7 and TopHAT products, both at version 7.6.3. The flaw allows any unauthenticated attacker to export arbitrary database tables via a crafted POST request to the product’s file export endpoint, resulting in full disclosure of sensitive backend data. Toptech Systems TMS7 and TopHAT are used in industrial/critical-infrastructure environments, including the Energy, Chemical, and Transportation Systems sectors, deployed worldwide.

Technical details

  • Root cause: The file export functionality on TMS7/TopHAT lacks any authentication or access-control check before returning database content.
  • Trigger condition: An attacker sends a crafted POST request to the file export endpoint; no credentials, session, or prior interaction are required.
  • Attack vector: Network — the endpoint is reachable over the network without authentication (AV:N, PR:N, UI:N).
  • Impact: Arbitrary database tables can be exported, exposing confidential data. The CVSS vector (AC:L/S:C/C:H/I:H/A:H) reflects low attack complexity, a scope change, and high impact to confidentiality, integrity, and availability.
  • Classification: CWE-552 (Files or Directories Accessible to External Parties).

Affected software

  • Toptech Systems TMS7 — version 7.6.3
  • Toptech Systems TopHAT — version 7.6.3
  • Versions 7.8 and later are not affected.

Severity

  • CVSS v3.1 Base Score: 10.0 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade Toptech Systems TMS7 and TopHAT to version 7.8 or later, which addresses this issue.
  • If no patch can be immediately applied:
    • Minimize network exposure of TMS7/TopHAT systems and ensure they are not directly accessible from the internet.
    • Place control system networks and remote devices behind firewalls and isolate them from business networks.
    • Where remote access is required, use secure methods such as a VPN, and keep the VPN itself patched and up to date.

References

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