Auth bypass in About Time Technologies Herowatch Go Server
CVE-2026-121817
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
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-139-11364-0dce6-2.html (third-party-advisory)
- www.twcert.org.tw/tw/cp-132-11366-d92ac-1.html (third-party-advisory)
Frequently asked questions
- What is CVE-2026-121817?
- CVE-2026-121817 is a high-severity vulnerability in About Time Technologies Herowatch Go Server, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.5/10. Published 2026-11-04.
- How severe is CVE-2026-121817?
- High severity. CVSS v3 base score is 7.5 out of 10.