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The March 2026 ICS Patch Tuesday roundup covered advisories from Siemens, Schneider Electric, Mitsubishi Electric and Moxa—but it was not a single patch release, and the products and flaws varied by vendor. Operators should match each notice to the exact product and version before changing an industrial system. This is a dated March snapshot, not a complete account of advisories available as of October 2026.
What the March 2026 roundup covered
SecurityWeek published its roundup on March 11, 2026, synthesizing vendor advisories rather than reporting independent patch testing. The affected technologies ranged from PLCs and numerical-control systems to industrial software, an SDK and EV chargers. The reported vulnerability classes included stored cross-site scripting, code injection, hard-coded credentials, denial of service, deserialization and issues involving third-party components. These are not shared flaws: each applies only to the products and conditions described in its own advisory.
The advisory counts are not a cross-vendor count of vulnerabilities. In particular, a vendor may publish multiple notices about different products or component issues; the number of notices does not establish a comparable level of risk.
Siemens: S7-1500 eval injection and other advisories
SecurityWeek reported six new Siemens advisories in the March roundup. Its coverage included a critical stored cross-site scripting issue in SIMATIC S7-1500 devices; a potentially severe misconfiguration involving Mendix applications; third-party vulnerabilities involving Fortinet, OpenSSL and other components; high- and medium-severity issues in the SICAM SIAPP SDK; and a low-severity issue in Heliox EV chargers. The Canadian Centre for Cyber Security’s March 10 alert also named SIMATIC S7-1500, Mendix Applications, SICAM SIAPP SDK, and Heliox Flex 180 kW and Mobile DC 40 kW charging stations among the products covered by Siemens’ wider advisory set.
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SIMATIC S7-1500: the trace-file attack path
Siemens ProductCERT advisory SSA-452276, “Eval Injection Vulnerability in SIMATIC S7-1500,” describes an attacker inducing a legitimate user to import a specially crafted trace file through the device’s web interface. The advisory was published March 10, 2026, and later updated May 12, 2026; the version surfaced in the advisory record was 1.3. Siemens assigned CVSS 9.6 under v3.1 and 9.4 under v4.0. It recommends updating affected products and provides specific countermeasures for cases where a fix is not yet available.
Those scores and the attack path belong to this specific S7-1500 advisory; they should not be generalized to Siemens’ other March notices. Check the advisory’s affected-product table for the exact CPU and version before deciding whether a particular installation is in scope.
Schneider Electric: six advisories across software and controllers
SecurityWeek reported six March advisories from Schneider Electric, each addressing one vulnerability. Its summary characterized the high-severity issues as hard-coded credentials in EcoStruxure IT Data Center Expert, local arbitrary code execution in EcoStruxure Power Monitoring Expert and Power Operation, and command execution that could result in full system compromise in EcoStruxure Automation Expert. It also described medium-severity flaws affecting Modicon controllers and Foxboro DCS.
Schneider Electric’s notification portal lists March 10 notices with product and version scope, along with linked technical records. Among the entries, CVE-2026-2273 concerns code injection in EcoStruxure Automation Expert versions before v25.0.1; CVE-2025-13957 concerns hard-coded credentials in EcoStruxure IT Data Center Expert v9.0 and earlier; and CVE-2025-11739 concerns deserialization of untrusted data in listed versions of EcoStruxure Power Monitoring Expert and Power Operation. The portal also lists notices involving Modicon M241, M251 and M258 controllers and ProLeiT Plant iT/Brewmaxx. For exact affected versions, impact and remediation, use the corresponding Schneider notice rather than inferring scope from a product-family name.
Mitsubishi Electric: numerical-control and MELSEC denial-of-service reports
SecurityWeek reported one new Mitsubishi Electric advisory for a remotely exploitable denial-of-service vulnerability in Numerical Control Systems, naming the C80, M800, M800V and M700V series. The roundup also noted multiple remotely exploitable denial-of-service flaws in MELSEC iQ-F Series controllers announced earlier in March.
The available March summary does not establish the exact advisory numbers, affected software or firmware versions, CVSS values, or patch steps for these reports. A series name alone is not enough to determine whether a specific installation is affected; consult the relevant Mitsubishi Electric product notice before planning an update.
Moxa: Intel component notices and a GNU Inetutils non-impact finding
SecurityWeek reported four new Moxa advisories. Three concerned vulnerabilities discovered in Intel products; the fourth said Moxa products were not affected by a recent GNU Inetutils vulnerability. The Intel-related notices do not mean that all Moxa products are vulnerable, nor does the summary establish which Moxa models or versions may be in scope. The available March summary does not provide verified advisory IDs, CVEs, product-version ranges or remediation details, so those must be confirmed in the applicable Moxa notice.
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How to check whether an installation is affected
Use the vendor’s notice for the exact product and version. A roundup can identify which advisories deserve attention, but it does not establish a universal instruction to patch every system or confirm that a specific installation is affected.
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- Identify the asset. Record the manufacturer, exact model or product family, and installed hardware, firmware and software versions. For industrial software or an SDK, note the release in use rather than relying on the controller model alone.
- Match the asset to the advisory’s scope. Check the affected-product table and version ranges. Do not treat a product mentioned in a vendor’s broader advisory set as automatically vulnerable to every issue in that set.
- Read the issue-specific impact and attack conditions. Distinguish, for example, a user-assisted trace-file import path from a flaw described as remotely exploitable, or a third-party component issue from a vendor-created vulnerability.
- Follow the vendor’s stated fix or countermeasure. Confirm the recommended update or mitigation for the exact version. If the notice provides a workaround because a fix is unavailable, assess that guidance with the personnel responsible for the system.
- Plan the change for the operational environment. Coordinate maintenance and validation with the people responsible for the affected control system. The March roundup does not provide a universal deployment procedure or establish that its fixes were independently tested.
Why this is only a March snapshot
Later CISA notices dated September 15 and 17, 2026, confirm that additional vendor advisories appeared after the March roundup, including notices involving Schneider Electric Modicon products and Mitsubishi Electric GX Works3 and CC-Link products. The March article therefore remains useful as a record of that month’s notices, but it should not be used as a current inventory of all ICS advisories or as evidence that an asset is secure after applying only March updates.
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