CVE-2026-25786: Critical XSS in PLC/Station Name Field
A critical cross-site scripting (XSS) vulnerability, tracked as CVE-2026-25786, has been identified in unspecified industrial control systems. According to the National Vulnerability Database, this flaw allows an authenticated attacker, with authorization to download a TIA project, to inject malicious scripts into the “communication” parameters page of the web interface. The vulnerability is rated a CVSS 9.1 (CRITICAL).
The attack vector exploits improper validation and sanitization of the PLC/station name displayed on the affected page. If a legitimate user with appropriate rights subsequently accesses this page, the malicious code would execute within the scope of their web session. This opens the door for session hijacking, credential theft, or further client-side attacks against high-privilege users.
While specific affected products are not detailed by the National Vulnerability Database, this generic description strongly points to Siemens TIA Portal-managed devices or similar industrial automation platforms. Defenders must assume that any system allowing TIA project downloads and displaying PLC/station names on a web interface could be at risk. This is a supply chain risk for ICS environments that cannot be ignored.
What This Means For You
- If your organization operates industrial control systems that utilize web interfaces for configuration or monitoring, you need to understand if this CVE-2026-25786 applies. This is a critical XSS with high impact across confidentiality, integrity, and availability. Attackers are looking for authenticated access, which means this could be an escalation path from a lower-privilege compromise or an insider threat. Audit your web-based ICS management interfaces and review any available vendor advisories for this CVE, even if specific products aren't yet named.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-25786: XSS in PLC/Station Name Field - Free Tier
title: CVE-2026-25786: XSS in PLC/Station Name Field - Free Tier
id: scw-2026-05-12-ai-1
status: experimental
level: critical
description: |
Detects attempts to exploit CVE-2026-25786 by identifying web requests to the 'communication' parameters page that include 'PLC/Station Name' in the query and a '<script>' tag, indicating a potential XSS injection attempt.
author: SCW Feed Engine (AI-generated)
date: 2026-05-12
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-25786/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/communication'
cs-uri-query|contains:
- 'PLC/Station Name'
cs-uri-query|contains:
- '<script>'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-25786 | XSS | PLC/station name rendered on the 'communication' parameters page of the web interface |
| CVE-2026-25786 | Auth Bypass | Authenticated attacker authorized to download a TIA project |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 12, 2026 at 13:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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