French Ministry of the Interior Cyberattack

Key points

• Cyberattack compromised email servers of the French Ministry of the Interior.
• Breach detected overnight between December 11 and December 12, 2025.
• Threat actors accessed document files on email systems.

This analysis groups the signal by industry, likely incident action and impacted security area. It helps compare this signal with other published signals without treating the labels as final determinations.

Affected organization

Interieur

Sector: Public Administration

Likely country: 🇫🇷 France

inferred from company domain

Estimated

Threat source

Hacking activity

Watch internet-facing systems, credential abuse and exploit activity.

• Source type: outside the affected organization

Business impact

Potential data exposure

Impact area: Confidentiality

Likely asset: User or customer data

Trend context

69 signals with similar action pattern

• 2 signals in the same sector
• 90 signals with the same likely impact area
• 1 signal linked to this organization/domain

Mentioned entities

InterieurData DisclosureFrench Ministry of the InteriorCyberattack The French Ministry ofInteriorCyberattackThreat

External sources

• The Week in Breach News: December 17, 2025 | Kaseyahttps://www.kaseya.com/blog/the-week-in-breach-news-12-17-25/Public source from kaseya.com.
• Frankrijk arresteert verdachte na cyberaanval op ministerie van Binnenlandse Zakenhttps://www.ictmagazine.nl/nieuws/frankrijk-arresteert-verdachte-na-cyberaanval-op-ministerie-van-binnenlandse-zaken/Public source from ictmagazine.nl.

Related signals

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Tchap·Jun 7, 2026

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Tchap (French government messaging service) data breach

A user account on Tchap, the French government's encrypted instant messaging service, was compromised due to account usurpation. The National Agency for the Security of Information Systems (Anssi) detected the compromise on June 7, 2026. The Interministerial Digital Directorate (Dinum) confirmed the incident and immediately blocked the malicious account. Potentially exposed data includes names, email addresses, affiliated entities, and avatars for at least 73,467 public agents. Private, end-to-end encrypted conversations were not affected, but content from public, unencrypted channels may have been accessed.

Numerique·Jun 7, 2026

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French Government Messaging Service Tchap Compromised

An incident on June 7, 2026, saw a user account on Tchap, the French government's encrypted instant messaging service, compromised. This led to unauthorized access and exfiltration of data from public, unencrypted chat rooms. Private, end-to-end encrypted conversations were not affected. The incident was detected by ANSSI and confirmed by DINUM, which immediately blocked the compromised account. The threat actor 'misere' claimed responsibility for the breach.

Nifty·Jun 28, 2026

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Stnet·Jun 28, 2026

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STNet, Inc. Affected by KDDI Corporation Data Breach

STNet, Inc., a Japanese internet service provider, was impacted by a data breach originating from an email system provided by KDDI Corporation. Threat actors gained unauthorized access to this shared system by exploiting a vulnerability in third-party software. This led to the potential exposure of up to 14.2 million email addresses and passwords across all affected ISPs. STNet customers' email addresses and passwords may have been compromised.

Kddi Web·Jun 28, 2026

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KDDI Web Communications Customer Data Affected by KDDI Email System Breach

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