critical severity November 12, 2026 · 1 min read

CISA ICS Advisory: Siemens Building Automation and Energy Products

Here’s what this advisory affects, and what to do about it.

This organization is reported to have suffered a critical-severity data breach. Full verified details will be added here as they are confirmed.

CISA ICS Advisory: Siemens Building Automation and Energy Products

CISA published an ICS advisory on November 12, 2026, detailing the impact of two critical unauthenticated remote code execution vulnerabilities in the PHP runtime, known as php2shell, on multiple Siemens building automation and energy products.

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Unauthenticated PHP remote code execution

The advisory addresses two critical vulnerabilities, CVE-2026-109618 and CVE-2026-109619, disclosed by the PHP project and security researchers on October 21, 2026. These flaws exist in the core PHP language runtime and allow unauthenticated remote code execution. The advisory evaluates which Siemens software products are affected by these issues.

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Affected Siemens products

The advisory examines the status of impact across various Siemens building automation and energy control system products. It does not list specific version numbers or product names in the provided summary. Siemens recommends that all affected devices be operated only in protected network environments.

What to do

Determine whether any Siemens building automation or energy products in your environment use the affected PHP runtime.
Restrict network access to affected devices using appropriate segmentation and access controls.
Configure the operational environment according to Siemens’ official guidance for protected IT networks.
Monitor Siemens’ product security updates for patches addressing php2shell.
Follow the specific mitigation steps listed in the CISA ICS advisory for each affected product.

Organizations operating industrial control systems should treat these PHP vulnerabilities as high priority due to their remote, unauthenticated nature in environments where Siemens building automation and energy products are commonly deployed.

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Sources: CISA ICS Advisory

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