Lockbit5 ransomware group lists comune.robeccosulnaviglio.mi.it on its leak site

• Ransomware group: Lockbit5
• Country: Italy
• Sector: Government & Defense
• Announcement date: September 14, 2026

LockBit5 claims a data breach against Italian municipality

The LockBit ransomware group has listed the Italian municipality Comune di Robecco sul Naviglio on its dedicated leak site. This announcement, made on September 14, 2026, marks a potential cyberattack targeting a local government entity. The threat actor claims that a data breach has occurred involving the institution, though the specific details surrounding the incident remain limited at this stage.

Ransomware groups often utilize leak sites to exert pressure on their victims. In many modern cyberattacks, threat actors employ a tactic known as double extortion. In this scenario, the attackers do not merely encrypt an organization's files to disrupt operations; they also exfiltrate sensitive data. The threat of releasing this stolen information on a public platform serves as additional leverage to compel the victim to pay a ransom. While the listing on the leak site is a significant development, it does not inherently confirm the full extent of the breach or the specific methods used by the attackers.

Details of the claim and the event

According to the announcement made on September 14, 2026, the LockBit group added the entity associated with the domain comune.robeccosulnaviglio.mi.it to its leak site. This claim of a data breach was made on the same day the listing appeared. However, the information provided by the threat actor is currently very sparse.

The available evidence, such as the screenshots provided by the group, does not offer a clear picture of the situation. Specifically, the provided screenshot does not contain any data samples that would allow for the verification of the claim. Furthermore, there are no details regarding a ransom demand, and no information has been provided concerning the specific volume of files or the total size of the data allegedly stolen during the attack.

Information regarding the leaked data

At this time, there is no information available regarding the nature of the leaked data. The screenshot provided by the group merely displays the landing page of a data leak platform, rather than specific files or databases.

The target organization

The target of this alleged attack is the Municipality of Robecco sul Naviglio. This is a local government entity located within the Metropolitan City of Milan, Italy. As a municipal body, it plays a vital role in the region by providing various administrative, social, and municipal services to the citizens living in the area.

Potential implications and risks

Because the target is a public institution, a potential data breach carries significant implications for the community. Such an event may lead to the exposure of citizens' personal information. Since the institution operates within Italy, the situation may require evaluation under the EU General Data Protection Regulation (GDPR), which governs how personal data must be protected and how breaches must be reported.

Breaches targeting public institutions can create secondary risks for the population, such as identity theft and the execution of targeted phishing attacks. When personal details are leaked, attackers can use that information to craft highly convincing fraudulent communications to deceive individuals.

The group involved, LockBit, is a Ransomware-as-a-Service (RaaS) group that has been tracked since 2019. It is notable that the group is reported to have returned with a new version after its infrastructure was disrupted in February 2024. This persistence highlights the ongoing threat posed by such groups to public sector continuity and data privacy.

To mitigate these risks, organizations in the government and defense sector often implement various defensive measures. These include robust backup strategies, multi-factor authentication, and continuous monitoring of network traffic to detect unauthorized data exfiltration. Maintaining high standards of data privacy is essential for preserving public trust in government services.