0xBlackash/CVE-2026-48908

GitHubRepository PoCExploit

PoC files

2 files

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GitHub
Analysisdeepseek-v4-pro:cloud ·

Technical assessment

A Python script that exploits CVE-2026-48908, an unauthenticated arbitrary file upload vulnerability in SP Page Builder for Joomla, to upload a PHP webshell and achieve remote code execution.

Backdoor review

No backdoor observed in reviewed code

The PoC is a straightforward exploit for CVE-2026-48908. It uploads a PHP webshell via the vulnerable endpoint and executes commands. No concealed backdoor, unrelated payload, or deceptive behavior targeting the PoC operator was observed.

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 script actively uploads a PHP webshell and executes commands on the target, which constitutes exploitation, not just detection or scanning.

CVE-2026-48908.py:61-98CVE-2026-48908.py:119-125CVE-2026-48908.py:187-198

Requirements

  • Target running a vulnerable version of SP Page Builder (<= 6.6.1) with the com_sppagebuilder component accessible.CVE-2026-48908.py:5CVE-2026-48908.py:12

Observed behavior

  • Constructs a malicious ZIP archive containing a PHP webshell and supporting IcoMoon files.CVE-2026-48908.py:61-98
  • Sends an unauthenticated POST request to the vulnerable upload endpoint to upload the malicious ZIP.CVE-2026-48908.py:101-116
  • Executes arbitrary system commands on the target server by sending GET requests to the uploaded webshell.CVE-2026-48908.py:119-125
  • Provides an interactive shell mode for continuous command execution.CVE-2026-48908.py:187-198
Safety-review evidence

Behaviors behind the backdoor verdict

Observables

Webshell Upload
PHP webshell with token-based access controlThe PoC uploads a PHP file that executes system commands when provided with a correct token. This is the intended exploit behavior for the stated CVE.CVE-2026-48908.py:61-98
Command Execution
system($_GET['c']) and system($_GET['cmd'])The uploaded webshell executes arbitrary system commands passed via HTTP GET parameters. This is the core RCE functionality of the exploit.CVE-2026-48908.py:68-72
Token Verification
Token check: if ($_GET['t'] ?? '' !== '{token}')The webshell requires a secret token to execute commands, preventing unauthorized use of the uploaded shell by third parties.CVE-2026-48908.py:64-67
Review boundaries

What the analysis did not establish

  • Only the two text files (CVE-2026-48908.py and README.md) were reviewed; no binary files were present or analyzed.
  • The review does not assess the safety of executing the PoC against unauthorized targets, only whether the PoC itself contains backdoor behavior.
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