CVE-2026-121624
Nanosystems Supremo before 5.0.2.3874 Improper TLS Certificate Validation
CVSS Score
6.8
EPSS Score
0.0%
EPSS Percentile
0th
Nanosystems Supremo for Windows and macOS before 5.0.2.3874 contains an improper certificate validation vulnerability that allows adjacent attackers to intercept TLS connections by presenting untrusted certificates. Attackers on the same network can terminate and relay the client's TLS session using self-signed certificates to read usernames, SHA-256 password hashes, and license codes.
| CWE | CWE-295 |
| Vendor | nanosystems |
| Product | supremo |
| Published | Nov 3, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Attack Vector
Adjacent
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
Nanosystems / Supremo
0 < 5.0.2.3874
References
pusi77.eu.org: https://pusi77.eu.org/blog/2026-11-03-supremo-tls-cve supremocontrol.com: https://www.supremocontrol.com/changelog/ supremocontrol.com: https://www.supremocontrol.com/ vulncheck.com: https://www.vulncheck.com/advisories/nanosystems-supremo-before-5.0.2.3874-improper-tls-certificate-validation
Credits
Andrea Pusineri