Hauts-de-Seine Department Hit by Major Cyberattack, Systems Taken Offline as Precaution

On May 20, 2025, the Hauts-de-Seine department in France was hit by a large-scale cyberattack, forcing local authorities to shut down all IT systems and communication channels indefinitely.

The department council announced the cyberattack in a message on X (formerly Twitter):

“Le Département a été victime d’une cyberattaque de grande ampleur. L’ensemble des systèmes d’information et des moyens de communication habituels ont été désactivés pour une période indéterminée.”

(“The Department was