More than 40 Polish offices published PESEL in BIP. Here's what we found

Google search allows to usage appropriate parameters related to, among others, the literal occurrence of a phrase (by placing in quotes) or narrowing the search to a given domain (under the parameter "site:"). In December 2025 [described](https://cyberdefence24.pl/cybersecurity/google-hacking-kilkset-number-pesel-in-arkus-excela) thus uncovering a fewer 100 PESEL numbers in publically available Excel sheets – 1 of them afraid the wards of the foundation, and the another came from the BIP of 1 of the municipalities.