Vulnerability · Published Nov 3, 2026 · Assigned by VulnCheck

CVE-2026-121624Nanosystems Supremo before 5.0.2.3874 Improper TLS Certificate Validation

Medium 6.8

In plain English

A medium-severity improper certificate validation in Supremo from Nanosystems. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).

Severity (CVSS 3.1)6.8Medium

Exploit odds (30 days)0.1%top 97.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
Nanosystems	Supremo	0 – before 5.0.2.3874

Weakness: CWE-295 · Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References

https://pusi77.eu.org/blog/2026-11-03-supremo-tls-cve technical-description
https://www.supremocontrol.com/changelog/ release-notes
https://www.supremocontrol.com/ product
VulnCheck Advisory: Nanosystems Supremo before 5.0.2.3874 Improper TLS Certificate Validation third-party-advisory