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CVE-2026-78312 – Unauthenticated Path Traversal – Delta Electronics DIAEnergie before v1.11.00.022

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Summary

CVE-2026-78312 is a critical path traversal vulnerability (CWE-22) affecting Delta Electronics DIAEnergie, an industrial energy management system used in manufacturing and utility environments. The flaw allows an unauthenticated, remote attacker to traverse the application’s file system and access files and directories outside those intended to be exposed, resulting in high impact to both integrity and availability. It carries a CVSS v3.1 base score of 9.1 (Critical) and affects all DIAEnergie versions prior to 1.11.00.022.

Technical details

  • Root cause: DIAEnergie fails to properly sanitize or restrict user-supplied file paths within its web application, permitting directory/path traversal sequences to reach the underlying file system.
  • Trigger conditions: An attacker sends a specially crafted request containing path traversal sequences to a vulnerable DIAEnergie web endpoint; no valid credentials or user interaction are required.
  • Attack vector: Network — the vulnerability is remotely exploitable over the network (AV:N), with low attack complexity (AC:L) and no privileges (PR:N) or user interaction (UI:N) required.
  • Impact: Successful exploitation does not directly expose confidentiality of data (C:N) but allows high-impact tampering and disruption — attackers can write, modify, or otherwise interfere with files outside intended directories, and disrupt system availability, potentially affecting energy management operations.
  • This vulnerability was disclosed alongside five other DIAEnergie flaws (CVE-2026-78308, 78309, 78310, 78311, 78313) in the same vendor advisory, ranging from authentication bypass to SQL injection and access control issues — indicating broader systemic weaknesses in the application’s input handling and access controls.

Affected software

  • Delta Electronics DIAEnergie — all versions prior to v1.11.00.022

Severity

  • CVSS v3.1 Base Score: 9.1 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Mitigation and recommended actions

  • Immediate: Contact Delta Electronics technical support to obtain and upgrade to DIAEnergie v1.11.00.022 or later, which corrects this vulnerability.
  • If immediate patching is not possible:
    • Avoid exposing DIAEnergie systems and interfaces directly to the internet.
    • Place DIAEnergie servers and related control systems behind a firewall, isolated from general business networks.
    • Require remote access to go through a secure method such as a VPN.
    • Monitor network traffic to DIAEnergie web endpoints for anomalous requests containing path traversal patterns (e.g., ../ sequences).

References

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