Russian authorities used Cellebrite phone-cracking technology to break into a device belonging to a prominent domestic human rights activist they arrested and imprisoned, despite the company canceling its contract with the Russian government, according to a report published Thursday.

The University of Toronto’s Citizen Lab reached its conclusions after analyzing a phone belonging to Andrey Pivovarov and examining court documents he provided confirming the usage of Cellebrite’s UFED product.

Pivovarov was arrested in March 2021, sentenced in 2022 and released in 2024 as part of a prisoner exchange. Citizen Lab found evidence that authorities accessed his phone around June 2021 while the phone was in Russian government hands.

Investigators also said it appears Russian authorities might have used information it got from Pivoarov’s phone to surveil other regime opponents, combining information in the court documents with the later targeting of fellow dissident Anastasiya Burakova in a hacking campaign linked to Russia’s Federal Security Service (FSB).

“The historic architecture of Cellebrite forensic systems means that much of the functionality in the UFED product has continued to operate long after updates cease,” Citizen Lab said in its report. “Furthermore, Cellebrite systems have historically featured an offline mode. Consequently, the way Cellebrite’s technology was designed appeared to make it difficult for the company to meaningfully cut off problematic customers.

“While Cellebrite has argued that its cancellations in Russia … went beyond what was legally required, this investigation contributes evidence that the contract cancellation did not immediately block Russia from leveraging Cellebrite’s tools for political persecution,” it continued.

Cellebrite provided a response to Citizen Lab’s report, saying that Cellebrite’s technology would be ineffective in Russia today.

“Any use of legacy Cellebrite hardware in Russia after March 2021 is entirely unauthorized,” Cellebrite spokesperson Victor Cooper told CyberScoop, echoing the Citizen Lab response. “The Cellebrite hardware previously sold, prior to March 2021, would now be incompatible with modern devices and would operate without our technical support, our consent or any legal sanction from Cellebrite. Rapid technology advances render legacy digital forensic hardware and software ineffective within a short period of time. Russia remains permanently on our restricted-customer list.”

The Russian Embassy in Washington, D.C. did not immediately respond to a request for comment.