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VulnerabilityPublished

CVE-2026-28704: Japan Computer Emergency Response Team Coordination Center (JPCERT/CC) Emocheck · Uncontrolled Search Path Element

Affects Japan Computer Emergency Response Team Coordination Center (JPCERT/CC) EmocheckSource CVE Database V5

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Not known to be exploited · CVSS 7.8 High.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.0 base score
7.8High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 10 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Japan Computer Emergency Response Team Coordination Center (JPCERT/CC)EmocheckAffected
  • =all versions
Fixed in–
GitHubjpcertcc/EmoCheckpkg:github/jpcertcc/EmoCheckOther threatsAffected
  • *
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Until an official fix is released, users should avoid running Emocheck in directories where untrusted DLLs could be placed. Running Emocheck with least privilege and in controlled environments may reduce risk. Monitor official JPCERT/CC communications for updates and patches.

Description

Emocheck insecurely loads Dynamic Link Libraries (DLLs). If a crafted DLL file is placed to the same directory, an arbitrary code may be executed with the privilege of the user invoking EmoCheck.

References

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