CyberSecBulletin
CVE-2026-58114NVD status: Awaiting Analysis

SIMATIC BATCH V9.1: Weak Authentication

Published Updated By the CyberSecBulletin desk

CVE-2026-58114 is a high-severity weak authentication vulnerability in SIMATIC BATCH V9.1 from Siemens, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. Affected SIMATIC BATCH V9.1 versions: all versions. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.34% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Check which version of SIMATIC BATCH V9.1 you run against the affected versions below, and install the vendor's latest release.
  2. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
  3. Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.

Affected products and versions

VendorProductAffected versionsFixed in
SiemensSIMATIC BATCH V9.1all versionsNot stated
SiemensSIMATIC Information Server 2020all versionsNot stated
SiemensSIMATIC Information Server 2022all versionsNot stated
SiemensSIMATIC PCS 7 V9.1all versionsNot stated
SiemensSIMATIC Process Historian 2020all versionsNot stated
SiemensSIMATIC Process Historian 2022all versionsNot stated
SiemensSIMATIC WinCC Runtime Professional V17all versionsNot stated
SiemensSIMATIC WinCC Runtime Professional V18all versionsNot stated
SiemensSIMATIC WinCC Runtime Professional V19all versionsNot stated
SiemensSIMATIC WinCC Runtime Professional V20all versionsNot stated
SiemensSIMATIC WinCC Runtime Professional V21all versionsNot stated
SiemensSIMATIC WinCC V7.5all versionsNot stated
SiemensSIMATIC WinCC V8.0all versionsNot stated
SiemensSIMATIC WinCC V8.1all versionsNot stated

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
HighSuccess depends on conditions outside the attacker's control.
Privileges required
NoneNo account or login is needed.
User interaction
RequiredA user must take an action such as opening a file or link.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H. Scored by CNA (siemens.com).

Scoring systemScoreSeverityScored by
CVSS 4.07.7HighCNA (siemens.com)
CVSS 3.17.5HighCNA (siemens.com)

Official description

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.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Weak Authentication

The product uses an authentication mechanism to restrict access to specific users or identities, but the mechanism does not sufficiently prove that the claimed identity is correct.

More Weak Authentication vulnerabilities (CWE-1390)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in SIMATIC BATCH V9.1

All SIMATIC BATCH V9.1 vulnerabilities

Recent Weak Authentication vulnerabilities

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