CVE-2026-25789

Affected devices do not properly validate and sanitize filenames on the Firmware Update page....

7.2 High

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: Low
User interaction: Active

What an attacker can affect

Confidentiality: Low
Integrity: High
Availability: High

Exploit likelihood

0.27%Up 0.1 points since May 12, 2026

What each source reports

CVE List Score used 7.2

Record: CVE-2026-25789
CVSS 4.0: 7.2 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:A/VC:L/VI:H/VA:H/SC:L/SI:H/SA:H
CVSS 3.1: 7.1 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-79
Updated: 2026-11-02

EUVDEUVD-2026-29428 7.2

Record: EUVD-2026-29428
CVSS 4.0: 7.2 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:A/VC:L/VI:H/VA:H/SC:L/SI:H/SA:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-r662-c7v7-m9h4 7.2

Affected devices do not properly validate and sanitize filenames on the Firmware Update page....

Record: GHSA-r662-c7v7-m9h4
CVSS 4.0: 7.2 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:A/VC:L/VI:H/VA:H/SC:L/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 7.1 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-79
Updated: 2026-11-02

NVD 7.2

Record: CVE-2026-25789
CVSS 4.0: 7.2 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:A/VC:L/VI:H/VA:H/SC:L/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 7.1 HighCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-79
Updated: 2026-11-02

Affected products

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History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-25789 is a high vulnerability (CVSS 7.2) in Siemens Simatic Drive Controller Cpu 1504d Tf, published May 12, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.27%, the 20th percentile. No source names a fixed version.