CVE-2026-121818
About Time Technologies｜Herowatch Go - Security Misconfiguration
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.
Fixes and workarounds
Fix
The product is no longer maintained. Users are advised to replace it with a supported device.
Source: CNA: twcertAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| Herowatch Go About Time Technologies |
all (affected, custom)
Other versions: unaffected |
CNA: twcert |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 8.5 high |
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | CNA: twcert |
| 3.1 / 7.8 high |
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | CNA: twcert |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://www.twcert.org.tw/en/cp-139-11362-1e829-2.htmlCNA: twcert · third-party-advisory
- https://www.twcert.org.tw/tw/cp-132-11360-ab123-1.htmlCNA: twcert · third-party-advisory
For agents and automation
Read public disclosures for free as Markdown or JSON. Compatible browsers also expose native WebMCP tools to search disclosures, read this page, and discover API access.
Use the ontology-linked Cyber API with x402 pay per request, or a Y2 Pro or Elite API key with the intel:cyber scope.
Endpoints and access details
https://api.y2.dev/api/v2/cyber/cveshttps://api.y2.dev/api/v2/cyber/cves/{cveId}
A workspace owner or admin can create a Pro or Elite API key. Send Authorization: Bearer <Y2_API_KEY> from your trusted agent runtime.
For x402, omit Authorization and read the HTTP 402 payment challenge before signing a retry. Public browser tools do not make payments.