CVE-2026-78310: DIAEnergie Auth Bypass Vulnerability

CVE-2026-78310 Overview

CVE-2026-78310 is an authorization bypass vulnerability affecting Delta Electronics DIAEnergie, an industrial energy management platform. The flaw stems from improper validation of user-controlled keys, classified under [CWE-639] (Authorization Bypass Through User-Controlled Key). An authenticated attacker with low privileges can manipulate identifiers in requests to access resources belonging to other users. The issue affects all DIAEnergie versions prior to 1.11.00.022. Delta Electronics published advisory Delta-PCSA-2026-00014 covering this and related issues (CVE-2026-78308 through CVE-2026-78313).

Critical Impact
Authenticated attackers can bypass authorization controls over the network to access data belonging to other DIAEnergie users, resulting in confidentiality loss.

Affected Products

Delta Electronics DIAEnergie versions prior to 1.11.00.022
Industrial energy management deployments using vulnerable DIAEnergie builds
Integrations relying on DIAEnergie APIs for user-scoped resources

Discovery Timeline

2026-09-24 - CVE CVE-2026-78310 published to NVD
2026-09-24 - Last updated in NVD database

Technical Details for CVE-2026-78310

Vulnerability Analysis

DIAEnergie fails to verify that an authenticated user is authorized to access the resource identified by a request parameter. The server trusts a user-controlled key, such as an object identifier passed in a URL or request body, when loading data. Because the key is not validated against the requester's session, modifying the identifier returns records owned by other accounts. This pattern is commonly referred to as an Insecure Direct Object Reference (IDOR).

Exploitation requires network access and valid low-privilege credentials, with no user interaction. The impact is limited to disclosure of information accessible through the affected endpoints; integrity and availability are not affected by this specific issue.

Root Cause

The root cause is missing or incomplete server-side authorization checks on endpoints that accept user-supplied identifiers. The application resolves the identifier to a backend record without confirming the requesting session owns or has rights to that record. [CWE-639] describes this class of flaw directly.

Attack Vector

An authenticated attacker intercepts a legitimate DIAEnergie request and substitutes the resource identifier with a value belonging to another tenant or user. The server returns the referenced record because it only authenticates the session rather than authorizing the specific object access. No exploit code or public proof-of-concept has been published at the time of writing. Technical details are referenced in the Delta Electronics Security Advisory.

// No verified exploitation code is available for CVE-2026-78310.
// Refer to Delta-PCSA-2026-00014 for vendor-provided technical details.

Detection Methods for CVE-2026-78310

Indicators of Compromise

Authenticated DIAEnergie sessions issuing sequential or enumerated identifier values in API requests
Response payloads containing records inconsistent with the authenticated user's expected scope
Spikes in GET requests to resource endpoints that reference numeric or GUID keys outside normal user activity

Detection Strategies

Enable verbose application and web-server logging for DIAEnergie endpoints that accept resource identifiers
Correlate session identity with returned object ownership to flag mismatches
Baseline normal per-user access patterns and alert on deviation, such as a single user retrieving records across many ownership scopes

Monitoring Recommendations

Forward DIAEnergie web and application logs to a centralized log store for retention and search
Monitor east-west traffic between DIAEnergie servers and operator workstations for anomalous API usage
Track authentication events and subsequent object access to detect low-privilege accounts probing identifiers

How to Mitigate CVE-2026-78310

Immediate Actions Required

Upgrade DIAEnergie to version 1.11.00.022 or later as directed by Delta Electronics
Review DIAEnergie user accounts and disable or rotate credentials for inactive low-privilege accounts
Restrict network reachability of DIAEnergie management interfaces to trusted operator networks

Patch Information

Delta Electronics addresses the vulnerability in DIAEnergie 1.11.00.022. Administrators should obtain the update through official Delta channels and follow the remediation steps in advisory Delta-PCSA-2026-00014, available in the Delta Electronics Security Advisory.

Workarounds

Place DIAEnergie behind a reverse proxy or web application firewall configured to log and inspect identifier parameters
Enforce network segmentation so only authorized engineering workstations can reach DIAEnergie
Apply least-privilege role assignments to limit which accounts can authenticate to the application

bash

# Example: restrict inbound access to DIAEnergie to a trusted management subnet
iptables -A INPUT -p tcp --dport 443 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP