In GLPI before version 9.5.2, there is a leakage of user information through the public FAQ. The issue was introduced in version 9.5.0 and patched in 9.5.2. As a workaround, disable public access to the FAQ.
https://github.com/glpi-project/glpi/security/advisories/GHSA-x9hg-j29f-wvvv
https://github.com/glpi-project/glpi/commit/39e25591efddc560e3679ab07e443ee6198705e2