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[Investigating][Severity: Major][Misconfiguration]

Saitama Citizens Medical Center: patient photos and staff data exposed through staff-page attachments

Direct access bypassed staff-page permissions, exposing two patient photos and two staff members’ names/phones. Actual leakage or resulting harm is unconfirmed.

Disclosed

2026-09-28

Organizations involved

1

Leaked or at risk

Unknown

Downtime

Unknown

Accessible attachment

Attachments on staff-only pages could be accessed directly without the intended permissions. A Center Manual uploaded on 20 July 2018 contained 2 patient photos and names/phone numbers of 2 staff members. Specific operations could show the patient photos before processing. The image count does not establish the patient count or the total number of people affected. [1]

As of the 28 September notice, no resulting harm was confirmed and actual third-party acquisition was not established. The notice gives neither a remediation completion date nor the date unintended access became possible. This is separate from the lost surgical-image media disclosed on 6 October. [1]

Timeline

  1. Disclosed 2026-09-28
  2. 1 days

Attack or cause

Method
[Misconfiguration]
Impact
[Data leak]
Entry point
Web app

Data exposed or at risk

[Health data][Name][Phone number]

Services hit

Organizations involved

Sources

  1. [1][Official]個人情報漏えいのおそれに関するお知らせとお詫びSaitama Citizens Medical Center · 2026-09-28
  2. [2][News]手術画像を保存した記録媒体を紛失 - さいたま市民医療センターSecurity NEXT · 2026-11-06