shinthink/CVE-2026-57827

GitHubRepository PoCExploit

PoC files

4 files

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GitHub
Analysisdeepseek-v4-pro:cloud ·

Technical assessment

Python exploit for CVE-2026-57827, an unauthenticated file upload vulnerability in the RSFiles! Joomla component. The script detects the component, uploads a PHP webshell by directly calling the unguarded 'rsfiles.upload' task, and executes commands on the target.

Backdoor review

No backdoor observed in reviewed code

The PoC is a Python script that exploits CVE-2026-57827, an unauthenticated file upload vulnerability in the RSFiles! Joomla component. It uploads a PHP webshell to the target server and executes commands. The script's behavior is fully consistent with its documented purpose. No concealed, deceptive, or unrelated harmful actions were found. The PHP payload is generated locally and sent to the target; there is no evidence of data exfiltration to a third party, undisclosed persistence, or any other backdoor behavior.

ClassificationExploit
Model confidence98%
AuthenticationNot required
Languagespython
Target softwareRSFiles! Joomla component (com_rsfiles)
Attack typesarbitrary file uploadremote code execution
Evidence & reasoningClassification basis · observed behavior · safety review
Technical evidence

Classification basis and observed behavior

Classification basis

The Python script actively exploits the vulnerability by uploading a PHP webshell and executing commands, which is the definition of an exploit. It does not merely check for the vulnerability.

cve_2026_57827.py:207-284cve_2026_57827.py:302-303

Requirements

  • Target must be running a vulnerable version of RSFiles! (< 1.17.12) with the default downloads folder accessible.cve_2026_57827.py:6

Observed behavior

  • Detects the RSFiles! component and its version by requesting known paths.cve_2026_57827.py:163-205
  • Uploads a PHP webshell by sending a POST request directly to the 'rsfiles.upload' task, bypassing the pre-flight check.cve_2026_57827.py:207-284
  • Executes commands on the target via the uploaded webshell and optionally cleans up the shell file.cve_2026_57827.py:286-314
Safety-review evidence

Behaviors behind the backdoor verdict

Observables

Php Webshell
Generated PHP file manager shell with token-based access, command execution, file upload, and file deletion capabilities.This is the payload uploaded to the target server to achieve RCE, as described in the README and implemented in the script.cve_2026_57827.py:72-92
Exploit Endpoint
/index.php?option=com_rsfiles&task=rsfiles.uploadThe vulnerable endpoint on the target Joomla server where the PHP shell is uploaded.cve_2026_57827.py:107
Command Execution
id;hostname;uname -aThe command executed on the target server to verify RCE, as shown in the script and README.cve_2026_57827.py:303
Review boundaries

What the analysis did not establish

  • Two text files (out of four total) were omitted from the evidence packet due to size constraints, but the provided files (README.md and cve_2026_57827.py) contain the complete exploit logic and documentation.
  • Two files (rsfiles.php and upload.php) were omitted from the text evidence, but they are described as vulnerable target component files, not part of the PoC script itself. The PoC script's behavior is fully readable and does not depend on executing those files.
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