CVE-2025-57700: Deltaww DIAEnergie XSS Vulnerability

CVE-2025-57700 Overview

CVE-2025-57700 is a stored cross-site scripting (XSS) vulnerability in Delta Electronics DIAEnergie, an industrial energy management system. An authenticated attacker with low privileges can inject malicious script content that is persistently stored by the application. When another user views the affected page, the injected script executes in that user's browser session.

The flaw is tracked under [CWE-79] (Improper Neutralization of Input During Web Page Generation). Exploitation requires user interaction, but successful attacks can lead to session theft, credential harvesting, or unauthorized actions performed as the victim within the DIAEnergie interface.

Critical Impact

Stored XSS in an industrial energy management platform enables authenticated attackers to hijack operator sessions and pivot to sensitive energy monitoring functions.

Affected Products

• Delta Electronics DIAEnergie (see vendor advisory for affected versions)

Discovery Timeline

• 2025-08-18 - CVE-2025-57700 published to NVD
• 2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-57700

Vulnerability Analysis

DIAEnergie fails to properly neutralize user-supplied input before storing it and rendering it back within web pages. An authenticated user submits crafted payloads containing HTML or JavaScript through an input field accepted by the application. The server persists this content without adequate sanitization or output encoding.

When any subsequent user loads the page that renders the stored content, their browser parses and executes the attacker's script in the context of the DIAEnergie origin. Because the script runs with the victim's session cookies and privileges, the attacker can read sensitive data, invoke administrative actions, or exfiltrate authentication tokens.

DIAEnergie is deployed in industrial and operational technology environments where compromised operator accounts may translate into visibility loss over energy assets. The vulnerability is network reachable and requires the victim to visit an affected view.

Root Cause

The root cause is missing or insufficient input validation and output encoding on fields whose values are later rendered inside HTML contexts. Data flows from an authenticated form submission into persistent storage, then back into a rendered page without contextual escaping. This pattern maps directly to [CWE-79].

Attack Vector

The attack vector is network based. An attacker first authenticates to DIAEnergie with any low-privileged account. The attacker submits a payload containing JavaScript into a stored field. A second user with a valid session later accesses the affected view, triggering execution of the injected script under that user's session context.

Refer to the Delta Security Advisory: Cross-Site Scripting Vulnerabilities for vendor-provided technical details.

Detection Methods for CVE-2025-57700

Indicators of Compromise

• Stored records in DIAEnergie containing HTML tags such as <script>, <img onerror=>, or <svg onload=> in fields that should contain plain text.
• Outbound HTTP requests from operator browsers to attacker-controlled domains following authenticated DIAEnergie sessions.
• Unexpected session activity, cookie exfiltration events, or account actions originating from operator workstations.

Detection Strategies

• Review DIAEnergie application logs and database entries for payload patterns containing script tags, JavaScript event handlers, or encoded variants such as %3Cscript%3E.
• Deploy a web application firewall in front of DIAEnergie to flag POST requests carrying HTML or JavaScript syntax in body parameters.
• Correlate authenticated write operations with subsequent anomalous browser activity from users who viewed the modified records.

Monitoring Recommendations

• Monitor DIAEnergie user activity for privilege changes, new administrative accounts, or configuration updates following suspicious form submissions.
• Track browser-generated network flows from workstations that access DIAEnergie to detect script-driven data exfiltration.
• Alert on repeated failed input validation events or Content Security Policy violations if CSP headers are enabled.

How to Mitigate CVE-2025-57700

Immediate Actions Required

• Apply the vendor patch referenced in Delta advisory PCSA-2025-00012 as soon as it is available in your environment.
• Restrict DIAEnergie web access to trusted management networks and require VPN or jump-host connectivity for remote administration.
• Audit existing DIAEnergie accounts and remove or downgrade unused low-privileged accounts that could be abused to plant payloads.

Patch Information

Delta Electronics has issued guidance in Delta-PCSA-2025-00012. Administrators should consult the advisory for the specific fixed version of DIAEnergie and upgrade accordingly.

Workarounds

• Segment DIAEnergie behind a reverse proxy or web application firewall configured to strip or block HTML and JavaScript syntax in request bodies.
• Enforce strict Content Security Policy headers at the proxy layer to limit inline script execution in DIAEnergie responses.
• Instruct operators to avoid accessing DIAEnergie from browsers used for general internet browsing until the patch is applied.

# Example WAF rule concept (ModSecurity syntax) to block script payloads in DIAEnergie POST bodies
SecRule REQUEST_METHOD "@streq POST" \
  "chain,phase:2,deny,status:403,id:1057700,msg:'DIAEnergie XSS payload blocked'"
  SecRule REQUEST_BODY "@rx (?i)(<script|onerror=|onload=|javascript:)" "t:none,t:urlDecodeUni"