---
id: CVE-2026-121818
title: About Time Technologies｜Herowatch Go - Security Misconfiguration
summary: >-
  Herowatch Mini developed by About Time Technologies has a system signing
  vulnerability. Authenticated local attackers can exploit a publicly available
  test key to sign malicious programs, allowing them to elevate privileges and
  execute a…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-1394
vendor: About Time Technologies
product: Herowatch Go
affected:
  - herowatch_go all
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-11-04T18:28:13.244033Z'
published: '2026-11-04'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T20:00:58.496Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-121818'
references:
  - url: 'https://www.twcert.org.tw/en/cp-139-11362-1e829-2.html'
  - url: 'https://www.twcert.org.tw/tw/cp-132-11360-ab123-1.html'
tags:
  - cve.org
epss: 0.00129
epssPercentile: 0.02518
ingestedAt: '2026-11-05T21:36:00.525Z'
---

## Overview

Herowatch Mini developed by About Time Technologies has a system signing vulnerability. Authenticated local attackers can exploit a publicly available test key to sign malicious programs, allowing them to elevate privileges and execute arbitrary code.

## Affected

- `herowatch_go all`

## Remediation

The product is no longer maintained. Users are advised to replace it with a supported device.