# Kraków education center personal data breach > Developing situation record from CLSTR: https://clstr.news/situations/krakw-education-center-personal-data-breach > Updated: 2026-10-13T06:12:46.000Z. Sources: 4. Developments: 2. The Municipal Education Service Center in Kraków (MCOO) reported a potential breach of personal data occurring in August 2025. An employee gained unauthorized possession of data storage media containing archival information, including sensitive details such as health status, disability degrees, incapacity for work, and trade union affiliations. Although the storage media were recovered on August 4, 2025, the MCOO acknowledged a temporary loss of control over the data. In response, the center notified the police and the President of the Personal Data Protection Office (UODO). Remedial actions included implementing staff security training and commissioning an expert to determine if any data was copied, opened, or deleted during the period of unauthorized access. Assessments of the breach highlight potential risks to affected individuals, including identity theft, discrimination, and damage to reputation or credibility. Experts have advised those impacted to monitor for suspicious communications and secure sensitive information such as PESEL numbers. ## Timeline ### 2026-10-13: Kraków Education Center reports personal data breach The Municipal Education Service Center in Kraków reported a data breach involving sensitive archival information, including health and union membership data, following unauthorized access to storage media. 3 sources. https://clstr.news/cluster/krakw-education-center-reports-personal-data-breach-1 ### 2026-09-29: Kraków education center reports personal data breach The Municipal Education Service Center in Kraków reported a data breach involving sensitive archival information, including health and trade union data, following unauthorized access to storage media. 2 sources. https://clstr.news/cluster/krakw-education-center-reports-personal-data-breach --- Cite as: Kraków education center personal data breach. CLSTR, https://clstr.news/situations/krakw-education-center-personal-data-breach