N.Y. PBO Law § 15

§ 15. Validation of official acts performed before filing official\noath or undertaking. If a public officer, duly chosen, has heretofore\nentered, or shall hereafter enter on the performance of the duties of\nhis or her office, without taking or filing an official oath, or\nexecuting or filing an official undertaking, as required by the\nconstitution, section ten of this article, section twenty-five of the\ntown law or section one hundred four of the uniform justice court act,\nor by any general or special law, his or her acts as such officer, so\nperformed, shall be as valid and of as full force and effect as if such\noath had been duly taken and filed, and as if such undertaking had been\nduly executed and filed, notwithstanding the provisions of any general\nor special law declaring any such office vacant, or authorizing it to be\ndeclared vacant, or to be filled as in case of vacancy, or imposing any\nother forfeiture or penalty for omission to take or file any such oath,\nor to execute or file any such undertaking; but this section shall not\notherwise affect any provision of any general or special law, declaring\nany such office vacant, or authorizing it to be declared vacant, or to\nbe filled as in case of vacancy, or imposing any other forfeiture or\npenalty, by reason of the failure to take or file any such oath or to\nexecute or file any such undertaking; and this section shall not relieve\nany such officer from criminal liability for entering on the discharge\nof his or her official duties without taking or filing such oath or\nexecuting or filing such undertaking in accordance with such provisions.\n