Threat watch / Attack
Chambourcy: town hall network shut down after a weekend cyberattack
The town hall of Chambourcy, in the Yvelines west of Paris, says it was the target of a cyberattack over the weekend of November 7 to 8, 2026. It shut down its IT network as a precaution, filed a complaint and informed the CNIL. Staff are working largely on paper; reception, phones, the website and social media still work. The town has not said how the attackers got in, whether data was taken, or whether ransomware was involved.
- Sector
- Government & politics
- Way in
- Not public yet
- Product or vendor
- None named
- How it happened
- Not public yet Checked 11 Nov 2026
- What was stolen
- Not public yet Checked 11 Nov 2026
- Who was impacted
- Town hall staff and residents of Chambourcy: the IT network was shut down as a precaution, services run largely on paper and emails are answered more slowly. Reception, phones, the town website and social media work normally, the town says.[1][2][3] Checked 11 Nov 2026
- Threat actor
- Not attributed
Timeline
- The town says the town hall "was the target this weekend of a cyberattack". It has shut down its network as a precaution, filed a complaint and informed the CNIL. It warns residents that the town hall, banks or police will never ask for passwords, card codes or urgent transfers. [1][2]
- InfosYvelines reports that the town does not disclose the origin of the attack or the exact scale of the data concerned, and has given no information on encryption or a ransom demand. [3]
- Cyberattaque.org reports that no theft of personal data, no ransomware and no ransom demand have been confirmed, and that no group has claimed the attack. [4]