Kodaira City’s Official Website Knocked Offline by Ransomware Attack — Personal Data Possibly Leaked

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The story

Tokyo’s Kodaira City official website has been inaccessible since shortly after 8 a.m. on October 7, after suffering a ransomware attack. According to the city, the cloud service used by the contractor that maintains the website appears to have been hit by a third party, and personal information of residents that the city had collected through its contact forms and other channels may have been leaked. There is no timeline yet for restoring service. On 5ch, the discussion branched out in all directions — doubts about the contracted cloud infrastructure and the state of government IT, distrust of the My Number (Japan’s national ID) system, and more.

In Tokyo’s Kodaira City, the city’s official website has been inaccessible since the 7th after being hit by a ransomware attack from a third party. According to the city, residents’ personal information may have been leaked.

According to Kodaira City, the website outage began shortly after 8 a.m. on the 7th, and there is still no prospect of restoration.

The cloud service used by the contractor responsible for maintaining the website is said to have been hit by a third-party ransomware attack, and personal information the city had obtained through its contact forms and other means may have been leaked. (Source continues below)

Source: news.yahoo.co.jp / Original article here

What people said

5AnonymousOct 8, 2026 17:13
Guess bureaucrats outsource literally everything, huh
15AnonymousOct 8, 2026 17:15
Re: #5
Just a clerical job
121AnonymousOct 8, 2026 18:15
Re: #5
A data center beats on-prem anyway, right?
18AnonymousOct 8, 2026 17:16
The real question is whether this was an inside job, deliberately leaked
19AnonymousOct 8, 2026 17:16
There's no way a city government can pay a ransom
So targeting Kodaira of all places means…
27AnonymousOct 8, 2026 17:18
Re: #19
We'll be fine if every resident just chips in ¥1,000
28AnonymousOct 8, 2026 17:18
If it's the IDC Frontier incident, a whole region just got wiped out, so there's probably no actual data leak
But snapshots and everything got nuked too, so without a local backup recovery is basically impossible
32AnonymousOct 8, 2026 17:20
Re: #28
No way the hackers didn't keep a copy for themselves
The whole point is to hold the data hostage for extortion
35AnonymousOct 8, 2026 17:20
Re: #28
Why are you being so naive about this?
36AnonymousOct 8, 2026 17:21
Isn't personal information supposed to be kept offline or something?
41AnonymousOct 8, 2026 17:21
Re: #36
If that were true, you wouldn't be able to print a residency certificate instantly at a convenience store lol
51AnonymousOct 8, 2026 17:25
Ugh…
Guess a My Number (national ID) data leak is coming soon too lol
54AnonymousOct 8, 2026 17:28
Re: #51
No problem
It's written right in the terms that even if My Number data gets leaked or misused, the government takes zero responsibility
57AnonymousOct 8, 2026 17:29
Re: #51
That's probably already happening lol
Going forward AI is going to pull together your LINE, Ameba, and old Twitter-era messages and link it all straight to your personal data
We're headed into an era where AI compiles celebrity wikis listing exactly who spent how many hours with whom at a love hotel — the tabloids are done for
64AnonymousOct 8, 2026 17:33
Re: #51
It's fine, the government takes zero responsibility anyway
84AnonymousOct 8, 2026 17:54
Deng Xiaoping was the paramount leader who drove China's reform and opening-up, laying the foundation for modern China's economic development.
(Just riffing on the "Shouhei" name connection — Kodaira is written with the same kanji, 小平, as Xiaoping)
110AnonymousOct 8, 2026 18:10
Re: #84
Is Otani a "Mao" too then? (continuing the pun chain — baseball star Shohei Otani shares the "Shouhei" reading, now linking to Chinese leader Mao Zedong)
97AnonymousOct 8, 2026 17:58
Wondering if I should buy a condo near Kodaira Station
Nerima and Itabashi are just too expensive
118AnonymousOct 8, 2026 18:13
Re: #97
There can't be many places right by the station…
Can you even build anything on the cemetery side?
112AnonymousOct 8, 2026 18:10
The takeover of IDC Frontier's cloud infrastructure really isn't getting the news coverage it deserves given how serious it is
124AnonymousOct 8, 2026 18:19
Re: #112
Maybe they're going easy on it out of deference to parent company SoftBank?
129AnonymousOct 8, 2026 18:22
Re: #112
The evening news really avoided saying "SoftBank"
(This was on) Nippon TV
127AnonymousOct 8, 2026 18:20
I used to live in Kodaira a while back
Wonder if my old data got swept up in this too
170AnonymousOct 8, 2026 18:47
Re: #127
Same here
Who knows
133AnonymousOct 8, 2026 18:23
This really shows just how much they've been looking down on IT engineers
The skill level is rock bottom
141AnonymousOct 8, 2026 18:26
Re: #133
Feels like it's already too late at this point
They tout "improved service" while it's full of holes
147AnonymousOct 8, 2026 18:29
Re: #133
It's less about the engineers and more that they don't want to pay for equipment or updates
156AnonymousOct 8, 2026 18:37
By this time next week, won't something like 30% of municipal websites in Japan be down?
160AnonymousOct 8, 2026 18:43
Re: #156
Honestly, it'd be better if it just disappeared outright
There's a real chance it gets secretly hijacked and starts pumping out misinformation
Imagine a flood-danger alert getting swapped for "It's fiiine, totally safe~"
186AnonymousOct 8, 2026 18:57
With a company, the motive is obvious — hold the data for ransom
But hacking a government system,
what's even the point, that part's unclear
Is this a dry run for a real crisis
a nation-vs-nation conflict
in other words, prep work for war?
193AnonymousOct 8, 2026 19:01
Re: #186
If residency certificates and other government services go down
I'd imagine quite a lot of people would be in real trouble
198AnonymousOct 8, 2026 19:03
But honestly, maybe it's a good thing they're attacking now? If a real war actually breaks out, the infrastructure attacks will be on a whole different level.
204AnonymousOct 8, 2026 19:05
Re: #198
They don't even need to attack infrastructure — the US, China, and Russia could all be wiped out instantly anyway

Background and Key Points of This Discussion

In recent years, ransomware attacks on local governments have increasingly entered not through the municipality itself but through a contracted cloud vendor. Local governments outsource much of their operations to vendors, which makes it hard for the public to see where responsibility for an outage or breach actually lies. In the thread, discussion went on without ever quite settling whether this was simply a case of “the site being encrypted and inaccessible” or whether “data was actually stolen.” In recent ransom-driven attacks, the common method has shifted to stealing data in advance and then threatening to publish it, so the site outage and the potential data leak may well be separate issues. Note that the information at risk here is data the city itself held via its contact forms and similar channels, and is not directly tied to the My Number national ID system itself.

*This article is compiled and summarized from the 5ch (News Express+) thread “[Tokyo] Kodaira City’s official website remains inaccessible after ransomware attack… residents’ personal information possibly leaked.”

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