[Version <= 12.1.0] backend plugin can trigger remote comand execution #1387

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opened 2026-10-05 00:41:56 +02:00 by adam · 0 comments

adam commented 2026-10-05 00:41:56 +02:00

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Yesterday I found xss in front-end, so I was wondering if the backend could execute the command

I found the place in the backend plugin that triggers command execution

first，we login into backend，and visit http://apupig.top/admin.php?page=plugins&tab=new

and download LocalFiles Editor

then click Activate it now

then click 1,2 in order, we will visit http://xxx.xxx/admin.php?page=plugin-LocalFilesEditor

we type ,then click save file

system($_POST[1]);

we can find detail in plugins/LocalFilesEditor/admin.php

it just uses the function stripslashes to handle parameters without filtering dangerous functions

so we can rce!

Yesterday I found xss in front-end, so I was wondering if the backend could execute the command I found the place in the backend plugin that triggers command execution first，we login into backend，and visit `http://apupig.top/admin.php?page=plugins&tab=new` and download `LocalFiles Editor`  then click `Activate it now`  then click 1,2 in order, we will visit `http://xxx.xxx/admin.php?page=plugin-LocalFilesEditor`  we type ,then click save file ```php system($_POST[1]); ```  we can find detail in `plugins/LocalFilesEditor/admin.php`  it just uses the function `stripslashes` to handle parameters without filtering dangerous functions so we can rce!  <!-- github-sync-id:1081673770 -->

adam closed this issue 2026-10-05 00:41:56 +02:00

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Reference: adam/Piwigo#1387