Improper access control vulnerability in GROWI prior to v5.1.4 (v5 series) and versions prior to v4.5.25 (v4 series) allows a remote authenticated attacker to bypass access restriction and download the markdown data from the pages set to private by the other users.
https://weseek.co.jp/en/news/2022/10/07/growi-private-page-can-be-viewed/