There are multiple indications that the company behind the Tisza Party’s data-collection app may have connections to Ukrainian national security services, said Tamás Lánczi, president of the Sovereignty Protection Office, in a Facebook post on Tuesday.

According to Lánczi, the office asked the Tisza Party a month ago to clarify who developed the app, where it was made, and how it was financed. The agency sought answers because of suspicions that foreign nationals might have participated in its creation or gained access to the personal data of Hungarian citizens.

“Tisza Party leader Péter Magyar refused to answer,” Lánczi wrote, adding that “as of yesterday, it became clear why.”

He stated that several signs now point to a company potentially linked to Ukrainian national security agencies as the developer of the application.

“Yesterday it also became evident that the Tisza Party failed to protect the data entrusted to it, leading to one of the most serious personal data breaches since the democratic transition,” Lánczi emphasized.

The agency head warned that the exposure of Hungarian citizens’ personal data creates opportunities for foreign political influence operations, disinformation campaigns, and election interference. It also makes the individuals affected by the leak potential targets for phishing and hacking attempts.

Lánczi added that the situation is aggravated by the fact that the app remains active, and the Tisza Party has not halted data collection despite the scandal.

The Sovereignty Protection Office again called on Péter Magyar to explain who participated in the app’s development, how they became connected with Miroslav Tokar and the Ukrainian company PettersonApps, how the sensitive data of Hungarian citizens was made public, and why data collection has not been suspended following the incident.