Siemens SIMATIC Batch up to 7.5/8.0/8.1/9.1 improper authentication

Summaryinfo

A vulnerability, which was classified as very critical, was found in Siemens SIMATIC Batch, SIMATIC Information Server, SIMATIC PCS 7, SIMATIC Process Historian, SIMATIC WinCC and SIMATIC WinCC Runtime Professional up to 7.5/8.0/8.1/9.1. The impacted element is an unknown function. The manipulation results in improper authentication. This vulnerability was named CVE-2026-58114. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability classified as very critical has been found in Siemens SIMATIC Batch, SIMATIC Information Server, SIMATIC PCS 7, SIMATIC Process Historian, SIMATIC WinCC and SIMATIC WinCC Runtime Professional up to 7.5/8.0/8.1/9.1. Affected is some unknown functionality. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

A vulnerability has been identified in SIMATIC BATCH V9.1 (All versions), SIMATIC Information Server 2020 (All versions), SIMATIC Information Server 2022 (All versions), SIMATIC PCS 7 V9.1 (All versions), SIMATIC Process Historian 2020 (All versions), SIMATIC Process Historian 2022 (All versions), SIMATIC WinCC Runtime Professional V17 (All versions), SIMATIC WinCC Runtime Professional V18 (All versions), SIMATIC WinCC Runtime Professional V19 (All versions), SIMATIC WinCC Runtime Professional V20 (All versions), SIMATIC WinCC Runtime Professional V21 (All versions), SIMATIC WinCC V7.5 (All versions), SIMATIC WinCC V8.0 (All versions), SIMATIC WinCC V8.1 (All versions). Affected systems do not properly secure their remote user authentication with the deprecated NTLM protocol. This could allow unauthenticated remote attackers, who have achieved a machine in the middle position, to relay NTLM authentication and impersonate a legitimate user. The potential impact depends on the services that are accessible, e.g. a SQL server used by WinCC.

The advisory is available at cert-portal.siemens.com. This vulnerability is traded as CVE-2026-58114 since 06/29/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 11/10/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• SCADA Software

Vendor

• Siemens

Name

• SIMATIC Batch
• SIMATIC Information Server
• SIMATIC PCS 7
• SIMATIC Process Historian
• SIMATIC WinCC
• SIMATIC WinCC Runtime Professional

Version

• 7.0
• 7.1
• 7.2
• 7.3
• 7.4
• 7.5
• 8.0
• 8.1
• 9.0
• 9.1

License

• commercial

Website

• Vendor: https://www.siemens.com/

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