---
id: CVE-2026-121817
title: About Time Technologies｜Herowatch Go Server - Insecure Direct Object Reference
summary: >-
  Herowatch Go Server developed by About Time Technologies has a Insecure Direct
  Object Reference vulnerability. Authenticated remote attackers can modify
  specific parameters to access or operate other users' data and functions.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-639
vendor: About Time Technologies
product: Herowatch Go Server
affected:
  - herowatch_go_server all
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-04T18:28:23.982957Z'
published: '2026-11-04'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T20:00:58.689Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-121817'
references:
  - url: 'https://www.twcert.org.tw/en/cp-139-11364-0dce6-2.html'
  - url: 'https://www.twcert.org.tw/tw/cp-132-11366-d92ac-1.html'
tags:
  - cve.org
epss: 0.00443
epssPercentile: 0.3876
ingestedAt: '2026-11-05T21:36:00.526Z'
---

## Overview

Herowatch Go Server developed by About Time Technologies has a Insecure Direct Object Reference vulnerability. Authenticated remote attackers can modify specific parameters to access or operate other users' data and functions.

## Affected

- `herowatch_go_server all`

## Remediation

The product is no longer maintained.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