CVE-2025-3091
MB connect line: Authorization bypass in mbCONNECT24/mymbCONNECT24
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
MB connect line: Authorization bypass in mbCONNECT24/mymbCONNECT24
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.
- Record
CVE-2025-3091- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-639
- Updated
- 2026-11-02
EUVDEUVD-2025-19010
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.
- Record
EUVD-2025-19010- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-3mpf-fhf9-62mx
An low privileged remote attacker in possession of the second factor for another user can login...
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.
- Record
GHSA-3mpf-fhf9-62mx- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-639
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2025-3091- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-639
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-3091 is a high vulnerability (CVSS 7.5) in Mb Connect Line Mbconnect24, published June 24, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.38%, the 32nd percentile. No source names a fixed version.