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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteYoido Full Gospel Church said on October 7, 2026, that a preliminary review found personal information associated with 850,000 people in a member-information-change-history file that may have been leaked. Investigators also reported indicators of possible AI-tool use in attacks linked to two Seoul churches, but AI involvement, the final amount of data exposed and the attackers’ identities have not been established.
What does the 850,000 figure count?
The figure is Yoido Full Gospel Church’s preliminary estimate, reported by SBS News on October 7, 2026. It refers to people associated with personal information in one file containing member-information change histories. It is not a final, independently confirmed count of people whose data was taken or misused.
The church said six of seven suspected files contained no personal information; the remaining file was the member-information-change-history file. Its preliminary account named names and dates of birth among the information involved. It also reported separate counts of records for changes to national identity numbers, phone numbers and addresses:
| Reported change-record category | Preliminary count |
|---|---|
| Resident registration number changes | 2,629 records |
| Phone-number changes | 3,964 records |
| Address changes | 7,202 records |
These are counts of change records, not established counts of distinct people. The church’s account does not establish that the current underlying identity numbers, phone numbers or addresses were all exposed.
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What is known about the suspected AI use?
Reuters reported that cybersecurity firm Oasis Security found church-linked data, attack records and account information on an overseas server. The firm cited references to “sub-agents” and lengthy reports that appeared automated as indicators that AI tools may have been used. This is evidence of possible AI-tool use, not confirmation that AI agents carried out particular stages of an intrusion.
The reporting does not establish which AI system was involved, whether any agents acted autonomously, or how much AI tools contributed. The attackers’ identities have not been established in the available accounts.
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Was another church affected?
Reuters also reported a separate suspected attack investigation at Sarang Church in Seoul. Oasis Security said a flaw in Sarang’s membership system could have allowed access to data associated with up to 89,580 registered accounts. That is a reported potential scope for a separate system flaw, not a confirmed number of people affected.
The two figures are not directly comparable: Yoido’s 850,000 is a preliminary people-associated figure tied to one change-history file, while Sarang’s up-to-89,580 figure concerns registered accounts potentially reachable through a system flaw. Their public findings also differ in maturity: Yoido described a preliminary review and response, while the Sarang figure was reported as the possible scope of a vulnerability under investigation. Reuters’ coverage of the two incidents is available through Internazionale’s Reuters report.
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What response did Yoido report?
Yoido said KISA notified it at 3 p.m. on the previous day of a suspected security breach. In a statement quoted by SBS News on October 7, 2026, the church said it began an emergency security check and analyzed suspected leak data and system access logs with an outside security specialist. SBS notes its English translation of the church statement may contain errors.
The church also said it was notifying affected members, blocking external access and changing server passwords. These are reported containment and notification steps; the final scope of any leak remains under investigation.
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