SQL injection vulnerability in the administrative backend in Piwigo through 2.9.1 allows remote users to execute arbitrary SQL commands via the cat_false or cat_true parameter in the comments or status page to cat_options.php.
https://www.exploit-db.com/exploits/43337/
https://github.com/Piwigo/Piwigo/commit/3dd6812412289a199564e63fffd0a9754010b9e0