CVE-2026-25789: 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 filenames on the Firmware Update page. This could allow a remote attacker to social engineer the user into selecting the modified firmware file to be uploaded. This would result in malitcious JavaScript execution in the context of the authenticated user's session without requiring the file to be uploaded, potentially leading to session hijacking or credential theft.
AI Analysis
Technical Summary
CVE-2026-25789 is a cross-site scripting vulnerability (CWE-79) in Siemens SIMATIC Drive Controller CPU 1504D TF. The issue arises from insufficient validation and sanitization of filenames on the Firmware Update page, allowing an attacker to craft filenames containing malicious JavaScript. When an authenticated user interacts with the modified filename, the script executes in their session context without needing the file to be uploaded. This can lead to session hijacking or credential theft. The vulnerability has a CVSS 3.1 base score of 7.1 (AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H). There is no vendor advisory or patch information available at this time.
Potential Impact
Successful exploitation can result in execution of arbitrary JavaScript in the context of an authenticated user's session, potentially leading to session hijacking and credential theft. The vulnerability requires user interaction (UI:R) and low privileges (PR:L) but can have high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should exercise caution when interacting with firmware update filenames and avoid selecting files from untrusted sources. Monitor Siemens advisories for updates.
CVE-2026-25789: 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 filenames on the Firmware Update page. This could allow a remote attacker to social engineer the user into selecting the modified firmware file to be uploaded. This would result in malitcious JavaScript execution in the context of the authenticated user's session without requiring the file to be uploaded, potentially leading to session hijacking or credential theft.
CVSS v3.1
Score 7.1high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-25789 is a cross-site scripting vulnerability (CWE-79) in Siemens SIMATIC Drive Controller CPU 1504D TF. The issue arises from insufficient validation and sanitization of filenames on the Firmware Update page, allowing an attacker to craft filenames containing malicious JavaScript. When an authenticated user interacts with the modified filename, the script executes in their session context without needing the file to be uploaded. This can lead to session hijacking or credential theft. The vulnerability has a CVSS 3.1 base score of 7.1 (AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H). There is no vendor advisory or patch information available at this time.
Potential Impact
Successful exploitation can result in execution of arbitrary JavaScript in the context of an authenticated user's session, potentially leading to session hijacking and credential theft. The vulnerability requires user interaction (UI:R) and low privileges (PR:L) but can have high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should exercise caution when interacting with firmware update filenames and avoid selecting files from untrusted sources. Monitor Siemens advisories for updates.
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: 6a02f11acbff5d8610c13ad7
Added to database: 05/12/2026, 09:21:30 UTC
Last enriched: 07/15/2026, 11:31:11 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 54
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