CVE-2025-40772 Siemens CVE debrief

Who should care

Organizations running Siemens SiPass integrated, especially administrators and security teams responsible for the product’s server applications and any shared user-facing web interfaces.

Technical summary

The supplied advisory describes a stored XSS condition affecting Siemens SiPass integrated server applications. The attacker’s injected content is rendered to other users, creating a path to session theft and user impersonation. The provided CVSS vector is CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H, indicating that exploitation requires adjacent access, low attack complexity, low privileges, and user interaction, with high potential impact to confidentiality, integrity, and availability. The remediation data in the corpus calls for updating to V3.0 or later and restricting access to authorized and trusted personnel only.

Defensive priority

High. Prioritize remediation for any deployment where multiple users can access the affected server applications or where the interface is exposed beyond a tightly controlled trusted network.

Recommended defensive actions

• Update Siemens SiPass integrated to V3.0 or later using the vendor remediation guidance supplied in the advisory.
• Restrict access to authorized and trusted personnel only until remediation is complete.
• Review any user-supplied or operator-supplied fields in the affected interfaces for stored XSS handling weaknesses.
• Apply defense-in-depth controls recommended for industrial control system environments, including limiting exposure of management interfaces.
• Monitor for suspicious script content or unexpected browser-side behavior in affected application pages after remediation.

Evidence notes

All statements are drawn from the supplied CISA CSAF source item and its listed Siemens/CISA references. The corpus states a stored XSS vulnerability in Siemens SiPass integrated, the impact of session theft and impersonation, the CVSS 3.1 vector AV:A/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H, and remediation to update to V3.0 or later plus access restriction. Published date used here is 2025-10-14; modified/republication context is 2026-02-12. The provided enrichment marks this as not listed in KEV.

Official resources