Exploit Title: FoF Pretty Mail 1.1.2 Extension for Flarum Local File  
Inclusion (LFI)  
Date: 03/28/2024  
Exploit Author: Chokri Hammedi  
Vendor Homepage:  
Software Link:  
Version: 1.1.2  
Tested on: Windows XP  
CVE: N/A  
The FoF Pretty Mail extension for Flarum is vulnerable to Local File  
Inclusion (LFI) due to the unsafe handling of file paths in the email  
template. An attacker with administrative access can exploit this  
vulnerability to include sensitive files from the server's file system in  
the email content, potentially leading to information disclosure.  
Steps to Reproduce:  
Log in as an administrator on the Flarum forum.  
Navigate to the FoF Pretty Mail extension settings.  
Edit the email default template and insert the following payload at the end  
of the template:  
{{ include('/etc/passwd') }}  
Save the changes to the email template.  
Trigger any action that sends an email, such as user registration or  
password reset.  
The recipient of the email will see the contents of the included file (in  
this case, /etc/passwd) in the email content.