Sihem Bensedrine, head of the former Truth and Dignity Commission (IVD), said in a statement on Tuesday that she had been banned from travelling after being summoned last Thursday by a financial crimes judge.
The judge told her she was charged with "having procured unjustified advantages," "harming the state," and "forgery," she said in her statement.
No court official could be reached for comment on the case.
Bensedrinee had been under investigation since February 2021 on allegations that she falsified parts of the report.
She is accused of accepting a bribe to include a passage accusing the Franco-Tunisian Bank (BFT) of corruption, allegations she refuted.
The IVD received testimonies from tens of thousands of victims of abuses including rape and torture following the country's 2011 pro-democracy revolution which had toppled dictator Zine El Abidine Ben Ali.
The body collected some 65,000 complaints covering the period of Ben Ali's rule and that of his predecessor Habib Bourguiba.
After its mandate ended, the commission issued a vast final report that was published in Tunisia's official journal in 2020.
Tunisia adopted a new, democratic constitution three years after Ben Ali was toppled, but despite a decade of tentative democracy, Bensedrine told AFP in 2020 that "the demons of the past came back."
Saied, who sacked the government and froze parliament in mid-2021 and later pushed through a new constitution concentrating power in his office, has been accused of attempting to restore an authoritarian system in the country.
He has accused those arrested in recent weeks of "terrorism" and "plotting against state security."