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CVE-2025-3091

MB connect line: Authorization bypass in mbCONNECT24/mymbCONNECT24

Published: Jun 24, 2025Updated: Jun 26, 2025 Sources: CVE List NVD BDUCWE-639
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.3%
Top 76.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

An low privileged remote attacker in possession of the second factor for another user can login as that user without knowledge of the other user`s password.

CVSS Vector Breakdown

AV:NAC:HPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-639

Affected Products

mbCONNECT24MB connect lineICS / OT / IoT
mymbCONNECT24MB connect lineICS / OT / IoT
myREX24HelmholzICS / OT / IoT
myREX24.virtualHelmholzICS / OT / IoT
mbCONNECT24MB connect line GmbH
SaaS
Cloud & SaaS / saas-application
mb connect linecommercialICS / OT / IoT
helmholzcommercialDEICS / OT / IoT
mb connect line gmbhcommercialCloud & SaaSaka mb connect line
and 3 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://certvde.com/en/advisories/VDE-2025-035
certvde.com
https://certvde.com/en/advisories/VDE-2025-038
certvde.com
https://nvd.nist.gov/vuln/detail/CVE-2025-3091
nvd.nist.gov
and 2 more references View all →

Timeline

Published
Jun 24, 2025
Last Updated
Jun 26, 2025

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