CVE-2026-25786
CriticalCVSS 9.1Exploitation Probability (EPSS)
Low risk29th percentile - higher than 29% of all known CVEs
Summary
Affected devices do not properly validate and sanitize PLC/station name rendered on the communication parameters page of the web interface. This allows an authenticated attacker authorized to download a TIA project into the product to inject malicious scripts. If a benign user with appropriate rights accesses the page, the malicious code executes in their session context.
Risk Assessment
The risk involves potential execution of malicious code in a privileged user's session, leading to data theft, privilege escalation, or further system compromise.
Recommendation
Immediately apply the firmware update provided by the vendor and restrict TIA project download permissions to trusted individuals only.
Other vulnerabilities in Siemens TIA Portal
See all- CVE-2026-25787Critical
The vulnerability in industrial devices is due to improper validation and sanitization of the Technology Object (TO) name displayed on the 'Motion Control Diagnostics' page of the web interface. This allows an authenticated attacker authorized to download a TIA project into the device to inject malicious scripts into the page.
- CVE-2025-40759High
A vulnerability in Siemens SIMATIC and TIA Portal products is caused by improper sanitization of stored security properties when parsing project files. An attacker can exploit this to trigger a type confusion and execute arbitrary code within the affected application.
Original NVD description (English source)
Affected devices do not properly validate and sanitize PLC/station name rendered on the "communication" parameters page of the web interface. This could allow an authenticated attacker who is authorized to download a TIA project into the product, to inject malicious scripts into the page. If a benign user with appropriate rights accesses the "communication" parameters page, the malicious code would be executed in the scope of their web session.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS