← SECOM Trust Systems CO., LTD. cases
Bugzilla #1548714 Certificate Misissuance

SECOM: "Default City" in Subject:localityName

RESOLVED FIXED SECOM Trust Systems CO., LTD.
AI Summary

SECOM Trust Systems CO., LTD. issued certificates containing 'Default City' in the localityName field, which is a violation of the Baseline Requirements. The issue was identified through a notification on the Mozilla dev-security-policy mailing list. SECOM acknowledged the problem, initiated revocation of the affected certificates, and implemented system improvements to prevent recurrence. The incident report detailed the timeline of actions taken, including the revocation of 24 certificates and the introduction of stricter validation processes. Despite these measures, two additional certificates with the same issue were later discovered and revoked.

Model: gpt-4o-mini Generated: 2026-06-13 18:11 UTC Confidence: 1.00
Chronology
  1. Issue reported on misissued.com
  2. SECOM became aware of the issue
  3. Incident report submitted by SECOM
  4. Last problematic certificate revoked
  5. Two new problematic certificates discovered and revoked
Participants
Wayne Thayer Hisashi Kamo Ryan Sleevi Jinta Nakamura
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