CVE-2026-25787: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Siemens SIMATIC Drive Controller CPU 1504D TF
Affected devices do not properly validate and sanitize Technology Object (TO) name rendered on the "Motion Control Diagnostics" 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 "Motion Control Diagnostics" parameters page, the malicious code would be executed in the scope of their web session.
AI Analysis
Technical Summary
The vulnerability in Siemens SIMATIC Drive Controller CPU 1504D TF arises from improper neutralization of input during web page generation (CWE-79). Specifically, the Technology Object (TO) name displayed on the Motion Control Diagnostics page is not properly sanitized, allowing an authenticated attacker authorized to download TIA projects to inject malicious scripts. These scripts execute in the context of the web session of any benign user who accesses the affected page with sufficient privileges. This can lead to complete compromise of confidentiality, integrity, and availability of the affected system's web interface session.
Potential Impact
Successful exploitation allows an attacker with authenticated access and project download rights to execute arbitrary scripts in the context of other users' web sessions who view the Motion Control Diagnostics page. This can result in full compromise of user sessions, data theft, manipulation, or disruption of system operations, reflecting high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Until a patch is available, restrict access to authorized users only and monitor for suspicious activity related to project downloads and web interface usage.
CVE-2026-25787: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Siemens SIMATIC Drive Controller CPU 1504D TF
Description
Affected devices do not properly validate and sanitize Technology Object (TO) name rendered on the "Motion Control Diagnostics" 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 "Motion Control Diagnostics" parameters page, the malicious code would be executed in the scope of their web session.
CVSS v3.1
Score 9.1critical
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in Siemens SIMATIC Drive Controller CPU 1504D TF arises from improper neutralization of input during web page generation (CWE-79). Specifically, the Technology Object (TO) name displayed on the Motion Control Diagnostics page is not properly sanitized, allowing an authenticated attacker authorized to download TIA projects to inject malicious scripts. These scripts execute in the context of the web session of any benign user who accesses the affected page with sufficient privileges. This can lead to complete compromise of confidentiality, integrity, and availability of the affected system's web interface session.
Potential Impact
Successful exploitation allows an attacker with authenticated access and project download rights to execute arbitrary scripts in the context of other users' web sessions who view the Motion Control Diagnostics page. This can result in full compromise of user sessions, data theft, manipulation, or disruption of system operations, reflecting high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Until a patch is available, restrict access to authorized users only and monitor for suspicious activity related to project downloads and web interface usage.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- siemens
- Date Reserved
- 2026-02-05T19:53:27.492Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a02f11acbff5d8610c13ad4
Added to database: 05/12/2026, 09:21:30 UTC
Last enriched: 07/15/2026, 11:31:03 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 77
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