CVE-2026-18390 Ministry of Justice General Directorate of Information Technology CVE debrief

Who should care

Defenders responsible for UYAP Document Editor systems should assess exposure and prioritize verification and remediation. This includes reviewing system configurations, ensuring proper neutralization of special elements used in OS commands, and monitoring system logs for potential command injection attempts. Additionally, defenders should verify UYAP Document Editor versions and update to 5.4.20 or later if necessary. Security teams and vulnerability管理人员,

Why it matters

Defenders should care about CVE-2026-18390 because it allows for potential unauthorized command execution in UYAP Document Editor systems, which could lead to system compromise or data breaches. Verification of system configurations and updates is necessary to prevent exploitation.

• Potential unauthorized command execution
• Possible system compromise or data breaches
• Need for verification of system configurations and updates

Technical summary

The UYAP Document Editor is vulnerable to OS command injection due to improper neutralization of special elements used in OS commands. This issue affects versions before 5.4.20. The vulnerability could allow for potential unauthorized command execution, leading to system compromise or data breaches. Defenders should prioritize verifying and updating UYAP Document Editor to version 5.4.20 or later to prevent exploitation. The vulnerability has a CVSS score of 7.8 and is classified as HIGH severity. The CVE record was published on 2026-10-12T13:57:33.532Z and has not been modified since then.

Defensive priority

Defenders should prioritize verifying and updating UYAP Document Editor to version 5.4.20 or later.

Recommended defensive actions

• Verify UYAP Document Editor version and update to 5.4.20 or later if necessary
• Review system configurations and ensure proper neutralization of special elements used in OS commands
• Monitor system logs for potential command injection attempts
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and source item provide details on the vulnerability, but additional information on exploitation or affected systems is limited. Defenders should verify UYAP Document Editor versions and review system configurations to ensure proper neutralization of special elements used in OS commands. The Ministry of Justice General Directorate of Information Technology has not provided further details on affected systems or exploitation attempts.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.