Brinztech Alert: Database of Aktywne Miasta is Leaked

Dark Web News Analysis

A threat actor on a known cybercrime forum is advertising the alleged leak of the database for Aktywne Miasta (“Active Cities”). This claim, if true, represents a critical and sensitive public-sector data breach.

My analysis confirms that Aktywne Miasta is a major Polish sports application used for coordinating national, regional, and municipal sports competitions (such as the “Cycling Capital of Poland”). Crucially, it is formally partnered with numerous Polish local governments and cities, which use the app to engage with their citizens.

The alleged breach, posted on a hacker forum, compromises data for 103,735 unique users. The data includes:

• Full PII (IDs, email addresses, full names, gender, age)
• Profile images
• Extensive, detailed sports activity data (competitions, GPS-related data, city group affiliations)

This incident is not isolated. It comes during a severe, ongoing cybersecurity crisis in Poland. Reports from 2025 confirm Poland has ranked #1 globally for ransomware detections, and the country has suffered a wave of major public data breaches, including a massive attack on the financial service SuperGrosz just weeks ago (early November 2025). This leak provides a pre-vetted, high-trust dataset for criminals to target Polish citizens by impersonating their local government.

Key Cybersecurity Insights

This alleged data breach presents a critical and immediate threat:

• Government/City Affiliation Risk: This is the most severe threat. Because Aktywne Miasta is partnered with local governments, the data provides a verified list of citizens affiliated with specific public-sector entities, making them prime targets for highly credible, state-sponsored, or organized criminal attacks.
• Extensive PII Exposure: The leak includes email addresses, full names, gender, age, and potentially identifiable profile images, providing a rich dataset for identity theft, targeted phishing, and social engineering attacks against individual users.
• Fitness Data Exploitation: The combination of PII with detailed activity data (points, distance, calories, competition names, and participation dates) allows for comprehensive user profiling, which could be exploited for health-related scams or even real-world surveillance if correlated with other data sources.
• Third-Party Supply Chain Vulnerability: The incident highlights the inherent cybersecurity risks of public-private partnerships. A vulnerability in a single third-party application (Aktywne Miasta) has resulted in a significant data breach for all its government partners.

Mitigation Strategies

In response to this claim, the company and its government partners must take immediate action:

• Immediate User Notification and Support: Aktywne Miasta and its partner cities must promptly notify all affected users, detailing the types of data compromised and advising them on immediate steps to secure their online presence (e.g., changing passwords, being vigilant against phishing).
• Enhanced Data Encryption and Access Control: Implement strong encryption protocols for all sensitive user data, both in transit and at rest. Review and enforce strict access control policies, including multi-factor authentication (MFA) for all administrative and database access.
• Comprehensive Third-Party Risk Assessment (TPRM): This is a critical lesson for the public sector. Government entities partnering with applications like Aktywne Miasta must conduct thorough cybersecurity assessments of all third-party vendors, evaluating their data handling practices, security controls, and incident response plans.
• Regular Security Audits and Penetration Testing: Conduct frequent, independent security audits, vulnerability assessments, and penetration testing on the application and its infrastructure to proactively identify and remediate weaknesses before they can be exploited by malicious actors.

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