About Time Technologies｜Herowatch Go - Security Misconfiguration
All versions of Herowatch Go App from About Time Technologies are affected. CVSS rates the flaw High at 8.5, and no fix is listed in the checked facts.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- No fix listed
- Who is exposed
- Specific setups only
Do first: Check whether your setup matches what the bug needs. Affected product is Herowatch Go App, all versions. The system signing uses a publicly available test key.
- Exploitation0/40No signal
- Exposure5/25Specific setups only
- Reach?/20Reach: unknown (data gap). No tracked technology or package matched
- Severity9.5/10CVSS 8.5, total technical impact per CISA
- No patch5/5No patch listed yet
What would change the score
- Would score about 70 if added to CISA KEV
- Would score about 65 if CISA's SSVC rates exploitation active
- Would score about 30 if CISA's SSVC rates it automatable
CVE-2026-121818 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.5 (high) and affects Herowatch Go; no fixed version is listed yet.
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- Published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- FIRST's estimate of the chance attackers exploit it in the next 30 days, updated daily.What do these mean? →
- 0.13% · 2nd percentile
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 20/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Specific setups only
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
Herowatch Mini from About Time Technologies has a system signing flaw: a publicly available test key can be used to sign malicious programs. An attacker with low-privilege local access, meaning they must already be logged in, can use this to raise their privileges and run arbitrary code.
Read the original 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.
What to do
Check whether your setup matches what the bug needs.
Affected product is Herowatch Go App, all versions. The system signing uses a publicly available test key.Workaround: The checked facts list no fix and no workaround. No mitigation can be named from these sources, so the advisory's own guidance is the place to look for interim steps.
Timeline
- CVE published
- First seen by cve.now
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- About Time Technologies Herowatch Go
All versions
Evidence 2
- Link
- Link
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-121818
Is CVE-2026-121818 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
The system signing uses a publicly available test key, so the signature check does not protect against malicious programs. An attacker who uses that key can sign malicious programs, which could elevate privileges and execute arbitrary code.Source: twcert.org.tw
Which versions are affected by CVE-2026-121818?
Herowatch Go: all versions.Source: cve.now feed data
Am I affected, and how do I check?
The advisory lists Herowatch Go App, all versions, with the version range starting at 0 and no upper limit. The checked facts do not describe a version command or setting for checking the installed build.Source: twcert.org.tw
How do I fix CVE-2026-121818?
The checked facts name no fixed version, so no upgrade target can be given from these sources. Check the About Time Technologies advisory for an update before relying on any version.Source: twcert.org.tw
What if there's no patch?
The checked facts list no fix and no workaround. No mitigation can be named from these sources, so the advisory's own guidance is the place to look for interim steps.Source: twcert.org.tw