CVE-2025-3091

MB connect line: Authorization bypass in mbCONNECT24/mymbCONNECT24

HIGH

7.5

CVSS Score

Published: June 24, 2025 at 08:10 AM UTC

Updated: June 17, 2026 at 09:19 AM UTC

4 products affected across 2 vendorsmbCONNECT24mymbCONNECT24myREX24.virtual

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Severity

HIGH7.5

Exploit prediction

EPSS 0.4%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

myREX24 · Helmholz

60%

v < 2.16.5v < 2.18.0

Affected range stops below 2.16.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.18.0, so it looks safe — our inference, not a vendor statement

myREX24.virtual · Helmholz

60%

v < 2.16.5v < 2.18.0

Affected range stops below 2.16.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.18.0, so it looks safe — our inference, not a vendor statement

mbCONNECT24 · Mbconnectline

60%

v < 2.16.5

Affected range stops below 2.16.5, so it looks safe — our inference, not a vendor statement

mymbCONNECT24 · Mbconnectline

60%

v < 2.16.5v < 2.18.0

Affected range stops below 2.16.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.18.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

Source: [email protected]

https://certvde.com/en/advisories/VDE-2025-035

Source: [email protected]

https://certvde.com/en/advisories/VDE-2025-038

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCERTVDE

Attack Vector: NETWORK
Complexity: HIGH
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-639

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