Please help me solve the task

Olga_Whoami

New member
Hello everybody

Please help me solve the task. Or at least tell me which way to look)
Those who know, I think they will solve the task in 1-2 minutes.
I need to find the flag (code word).
Given:
https://task2.ctf.singleton-security.ru (page)
And
https://task2.ctf.singleton-security.ru/?source (I assume this is the same page, but in the form of code)
and also a hint: Try to 'cat flag.php' to solve this challenge =)

I think, that:
- the flag is written in the file "flag.php". You can read it using the "cat" command.
- the file is accessed through a vulnerability on the page: https://task2.ctf.singleton-security.ru/

Thank you in advance for your help)))
 
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