critical severity July 14, 2026 · 1 min read

CISA ICS Advisory: Siemens Mendix Runtime (Update A)

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

This advisory is revoked. Re-investigation confirmed the reported behavior is expected platform configuration and does not expose the protected attribute. The following versions of Siemens Mendix Runtime are affected: Siemens Mendix Runtime vers:all/* (CVE-2026-7891)

CISA ICS Advisory: Siemens Mendix Runtime (Update A)

Reported vulnerability disproven

On September 24, 2026, the Cybersecurity and Infrastructure Security Agency (CISA) published and then immediately revoked an Industrial Control Systems (ICS) advisory concerning Siemens Mendix Runtime. After re-investigation, CISA confirmed that the reported behavior is an expected platform configuration and does not expose the protected attribute.

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Affected products

The original advisory had listed Siemens Mendix Runtime vers:all/* (CVE-2026-7891) as affected. Because the advisory has been revoked, no versions of the product are considered vulnerable under the reported issue.

What to do

Disregard the original ICSA-26-209-02 advisory as it has been formally revoked by CISA.
Confirm with Siemens whether any separate security guidance has been issued for Mendix Runtime.
Continue following standard patching and configuration hardening practices for industrial and low-code runtime environments.
Monitor both the CISA ICS advisories page and Siemens’ official security channel for any future updates on this CVE.

Revocations of this kind demonstrate the value of coordinated disclosure and post-publication validation in ICS environments where false positives can create unnecessary operational burden.

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Sources: CISA ICS Advisory

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critical September 24, 2026