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CVE-2026-121818

About Time Technologies｜Herowatch Go - Security Misconfiguration

Products / packages About Time Technologies Herowatch Go

Published

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Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 08/11/2026, 03:15:33 UTC
twcert · CVSS:4.0 · 8.5
Assessment vectorCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
twcert · CVSS:3.1 · 7.8
Assessment vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
The headline uses the highest imported catalog score. Assessments can differ by source and CVSS version.

Severity

high8.5

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Source guidance available

Review the recorded instructions. Guidance may be a workaround rather than a fixed version.

What this means

Herowatch Go by About Time Technologies has a security misconfiguration vulnerability, allowing authenticated local attackers to sign malicious programs using a publicly available test key, potentially elevating privileges. The vulnerability affects all versions. The product is no longer maintained.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

About Time Technologies · twcert

Herowatch Go

1 range
twcert version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

all

custom versions

unaffected

unknown

Other versions: unaffected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

The product is no longer maintained.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

twcert guidance ↗

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

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.

References

2 sources
www.twcert.org.tw/en/cp-139-11362-1e829-2.html
Source referencetwcert
www.twcert.org.tw/tw/cp-132-11360-ab123-1.html
Source referencetwcert

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-121818

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-1394 ↗

CWE-1394 Use of Default Cryptographic Key

twcert

Related →
Contributing organizations · 2
twcert

Assigning organization

2026-11-04
CISA-ADP

Additional data publisher

2026-11-04

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
  1. CVE · CVE-2026-121818

    Observed 2026-11-04T20:50:53.528Z · upstream updated 2026-11-04T20:00:58.496Z

    Prioritization updated

    before

    []

    after

    [
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-11-04T18:28:13.244033Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "no"
      },
      {
        "name": "Technical Impact",
        "value": "total"
      }
    ]
  }
]
  2. CVE · CVE-2026-121818

    Observed 2026-11-04T07:05:44.656Z · upstream updated 2026-11-04T06:56:13.525Z

    Product or version evidence changed

    before

    [
  {
    "vendor": "About Time Technologies",
    "name": "Herowatch Go",
    "platforms": [],
    "versions": [
      {
        "version": "0",
        "status": "affected",
        "lessThan": "*",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected",
    "cpes": [],
    "source": "twcert",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-121818"
  }
]

    after

    [
  {
    "vendor": "About Time Technologies",
    "name": "Herowatch Go",
    "platforms": [],
    "versions": [
      {
        "version": "all",
        "status": "affected",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected",
    "cpes": [],
    "source": "twcert",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-121818"
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.