CVE-2025-57702: Deltaww DIAEnergie XSS Vulnerability

CVE-2025-57702 Overview

CVE-2025-57702 is a reflected cross-site scripting (XSS) vulnerability in Delta Electronics DIAEnergie, an industrial energy management system. The flaw allows an authenticated attacker to inject malicious JavaScript into request parameters that the server reflects back into the browser without proper sanitization [CWE-79]. Successful exploitation requires user interaction, such as clicking a crafted link. The vulnerability affects confidentiality of the victim's session context within the web application.

Critical Impact
An attacker who convinces an authenticated DIAEnergie user to visit a crafted URL can execute arbitrary script in the victim's browser session, exposing sensitive energy monitoring data and application tokens.

Affected Products

Delta Electronics DIAEnergie
Industrial energy management deployments using the affected DIAEnergie web interface
Refer to the Delta Security Advisory: XSS Vulnerabilities for the specific fixed version

Discovery Timeline

2025-08-18 - CVE-2025-57702 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-57702

Vulnerability Analysis

DIAEnergie exposes a web interface used by operators to monitor and manage industrial energy data. One or more request parameters are reflected into the rendered HTML response without adequate encoding or filtering. An attacker who crafts a URL containing JavaScript payloads can trigger execution in the browser of any authenticated user who follows the link.

Exploitation requires low privileges on the application and user interaction, but the attack originates over the network. The reflected script executes within the same origin as DIAEnergie, giving the attacker access to session cookies, CSRF tokens, and any data rendered in the operator's session. The attack does not affect availability or integrity of stored server-side data directly, but it can serve as a pivot into higher-impact operations such as session takeover.

Root Cause

The root cause is missing output encoding on user-controlled input in the DIAEnergie web application. When a parameter value is echoed into an HTML context, script-relevant characters such as <, >, and " are not neutralized. This allows raw HTML and JavaScript to be interpreted by the browser rather than treated as data.

Attack Vector

An attacker crafts a URL to a vulnerable DIAEnergie endpoint with a JavaScript payload placed in a reflected parameter. The attacker delivers the URL through phishing, chat, or a malicious page that redirects the victim. When an authenticated DIAEnergie user opens the link, the server returns a response embedding the payload, and the browser executes the injected script in the DIAEnergie origin. Refer to the Delta Security Advisory for the specific affected endpoints and parameters.

No public proof-of-concept exploit code has been released for this issue.

Detection Methods for CVE-2025-57702

Indicators of Compromise

HTTP request logs on DIAEnergie servers containing script tags, javascript: URIs, or event handler names such as onerror= and onload= in query strings or POST bodies
Referrer headers pointing to external domains immediately followed by requests to DIAEnergie endpoints with encoded payloads
Unexpected outbound browser requests from operator workstations to attacker-controlled hosts shortly after DIAEnergie sessions
Session anomalies such as concurrent logins from different geographies for the same operator account

Detection Strategies

Inspect DIAEnergie web server access logs for reflected parameters containing HTML metacharacters or common XSS payload signatures
Deploy web application firewall rules that flag reflected input patterns targeting known DIAEnergie endpoints
Correlate browser process telemetry on operator hosts with DIAEnergie URL patterns to surface script execution triggered by crafted links

Monitoring Recommendations

Forward DIAEnergie application and web server logs to a central analytics platform for signature and anomaly monitoring
Alert on outbound connections from operator workstations to newly registered or uncategorized domains during active DIAEnergie sessions
Track email and chat gateway telemetry for URLs pointing at internal DIAEnergie hosts with suspicious parameter content

How to Mitigate CVE-2025-57702

Immediate Actions Required

Apply the fixed DIAEnergie release specified in the Delta Security Advisory: XSS Vulnerabilities
Restrict DIAEnergie web interface exposure to trusted management networks and remove any direct internet reachability
Rotate DIAEnergie user credentials and invalidate active sessions after patching
Brief operators to avoid clicking DIAEnergie links delivered through email, chat, or untrusted pages

Patch Information

Delta Electronics has published Delta-PCSA-2025-00012 addressing this XSS issue. Administrators should download the corrected DIAEnergie installer from the Delta Security Advisory and follow the vendor's upgrade procedure on all instances. Verify the running version after upgrade to confirm remediation.

Workarounds

Place DIAEnergie behind a web application firewall configured to block requests containing HTML or script metacharacters in reflected parameters
Enforce a strict Content-Security-Policy on the reverse proxy fronting DIAEnergie to block inline script execution
Limit DIAEnergie account privileges so operators have only the roles required, reducing the value of a hijacked session
Require multi-factor authentication for DIAEnergie access to raise the cost of session-based follow-on attacks

bash

# Example reverse-proxy hardening (nginx) fronting DIAEnergie
# Adds a strict Content-Security-Policy and blocks obvious XSS patterns
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; frame-ancestors 'none'" always;
add_header X-Content-Type-Options "nosniff" always;
add_header X-Frame-Options "DENY" always;

if ($args ~* "(<script|javascript:|onerror=|onload=)") {
    return 403;
}