Excerpt from Connexion Article, Published on Jun 15, 2025.
A major trial has begun in Lyon this week over one of France’s most significant data-related fraud cases, involving a serious breach at Adecco, a leading French work agency. Sixteen defendants are now standing trial at the Lyon correctional court on 22 charges, including organised fraud and identity threat, following a cyberattack that impacted around 72,000 victims. The central figure in the case is a 20-year-old described by prosecutors as highly intelligent, who allegedly continued illegal activities from custody using smuggled phones. The case centres around a 2022 data breach at Adecco, where a 19-year-old intern at a Besançon agency sold his login credentials via an encrypted messaging platform. The intern, who reportedly never received the promised €15,000 for the credentials, was arrested shortly after, which led investigators to unravel a complex network of pseudonyms and encrypted channels.
Access to Adecco’s internal systems enabled hackers to extract data on around eight million jobseekers, including sensitive banking details. Using this stolen Adecco data, the group issued automated withdrawals of €49.85—just under the fraud detection threshold—from thousands of accounts. In total, nearly 33,000 victims were defrauded, with losses reaching €1.6 million, and banks reimbursing approximately €1.4 million. Beyond the Adecco breach, prosecutors say the group, led by the main defendant, exploited other public aid schemes and used the stolen data to produce fake IDs and open mule accounts. The Adecco data played a crucial role in facilitating these operations.
Adecco has acknowledged a serious security lapse, stating that the intern should never have had unsupervised access to national databases. While the company is not on trial, the incident has sparked nationwide concern over data security practices in major employment platforms. The high-profile Adecco trial is expected to continue until June 27, with over 2,400 civil parties already registered.
To delve deeper into this topic, please read the full article Connexion.
