High severity · published Jun 23, 2026
CVE-2026-10521
Authenticated unintended access to critical program parameters
7.2
CVSS
0.6%
EPSS
No
On KEV
Description
An high privileged remote attacker can access a hidden configuration method, that should not be accessible by any user, to modify critical program parameters. This can result in a total loss of confidentiality, integrity and availability.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 46% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MB
mbCONNECT24 · MB connect line
0.0.0 before 2.20.2; 2.20.1 · source: vendor
MY
mymbCONNECT24 · MB connect line
0.0.0 before 2.20.2; 2.20.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-10521
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-10521
www.certvde.com
https://www.certvde.com/en/advisories/VDE-2026-068/
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