Vulnerability in About Time Technologies Herowatch Go
CVE-2026-121818
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.
Published .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- www.twcert.org.tw/en/cp-139-11362-1e829-2.html (third-party-advisory)
- www.twcert.org.tw/tw/cp-132-11360-ab123-1.html (third-party-advisory)
Frequently asked questions
- What is CVE-2026-121818?
- CVE-2026-121818 is a high-severity vulnerability in About Time Technologies Herowatch Go, classified under CWE-1394. CVSS score: 7.8/10. Published 2026-11-04.
- How severe is CVE-2026-121818?
- High severity. CVSS v3 base score is 7.8 out of 10.