System Signing Vulnerability in Herowatch Mini by About Time Technologies
CVE-2026-121818

8.5HIGH

Key Information:

Vendor

About Time Technologies

Status
Herowatch Go
Vendor
CVE Published:
4 November 2026

What is CVE-2026-121818?

The Herowatch Mini, developed by About Time Technologies, is susceptible to a system signing vulnerability that can be exploited by authenticated local attackers. Using a publicly available test key, these attackers can sign malicious programs, which may lead to privilege escalation and the execution of arbitrary code on affected systems. This vulnerability poses significant risks to system integrity and user data, demanding immediate attention from users and administrators.

Affected Version(s)

Herowatch Go all

References

https://www.twcert.org.tw/en/cp-139-11362-1e829-2.html
third-party-advisory
https://www.twcert.org.tw/tw/cp-132-11360-ab123-1.html
third-party-advisory

CVSS V4

Score:
8.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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