SignalAtlas
Share a reportManage my posts
Confirmed

Saitama Pref.: incomplete PDF masking in a disclosure released personal data on 536 students (gross)

An information-disclosure file’s masking could be undone, revealing withheld fields. Scope: 536 students (gross) in tuition-waiver records. Disclosed Sep 10, 2026.

Last updated: 2026-11-09

Overview

536 people (gross).

Timeline

  1. Occurred
  2. Discovered
  3. Disclosed

Organization response

Per the notice, the organisation investigated and contained the incident, notified individuals and offered monitoring or protective resources.

What you can do

Be wary of emails, SMS or calls impersonating the organisation; do not open links or attachments or enter passwords or card details. Change reused passwords on other services.

Sources

  1. 不開示情報のマスキングが不完全な文書の情報開示による個人情報を含む不開示情報の漏えいについて埼玉県 · 2026-11-09

Related information

Share a report

No published information yet

Information appears here after source checks or moderation.

Comments and replies

Write a comment

No account needed. Comments appear immediately.

Do not post private names, addresses, passwords, or codes. Automatic masking is limited; review your content before submitting.

Required fields are marked *.

After submitting the text, you can redact and attach images.

Loading the security check. You can submit once it is complete.