---
id: CVE-2026-121624
title: Nanosystems Supremo before 5.0.2.3874 Improper TLS Certificate Validation
summary: >-
  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…
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-295
vendor: Nanosystems
product: Supremo
affected:
  - Supremo < 5.0.2.3874
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-11-03T22:36:34.514075Z'
published: '2026-11-03'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T22:41:14.021Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-121624'
references:
  - url: 'https://pusi77.eu.org/blog/2026-11-03-supremo-tls-cve'
  - url: 'https://www.supremocontrol.com/changelog/'
  - url: 'https://www.supremocontrol.com/'
  - url: >-
      https://www.vulncheck.com/advisories/nanosystems-supremo-before-5.0.2.3874-improper-tls-certificate-validation
    label: >-
      VulnCheck Advisory: Nanosystems Supremo before 5.0.2.3874 Improper TLS
      Certificate Validation
tags:
  - cve.org
epss: 0.00132
epssPercentile: 0.02807
ingestedAt: '2026-11-05T20:33:06.605Z'
---

## Overview

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

- `Supremo < 5.0.2.3874`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.