SECOM: Repository service disruption affecting subordinate CAs (CTJ)

SECOM Trust Systems reported a service disruption affecting repository services for its subordinate CA, Cybertrust Japan (CTJ). The incident occurred from February 17 to February 18, 2026, due to a sudden surge in access requests that led to a temporary denial of service condition. SECOM self-reported the incident and confirmed that no certificates were affected. The root cause was identified as inadequate risk assessment regarding the cloud service provider's capacity to handle traffic spikes. Remediation actions included redesigning the system architecture and implementing automated mechanisms to ensure service continuity. All action items have been completed, and a closure report is being prepared.

1. 2026-02-17 Service disruption began due to a surge in access requests.
2. 2026-02-18 Service disruption ended after the affected server was isolated.
3. 2026-04-23 Closure report prepared after all remediation actions were completed.

1. 2026-02-19 Ml representative — Preliminary incident report submitted detailing the service disruption.
2. 2026-02-26 Ml representative — Full incident report provided with detailed analysis and timeline.
3. 2026-04-16 Ml representative — All action items completed; closure report preparation initiated.
4. 2026-04-23 Ml representative — Final incident report and closure summary submitted.
5. 2026-04-23 CCADB representative — Final call for comments on the incident report before closure.