shinthink/CVE-2026-48939

GitHubRepository PoCExploit

PoC files

4 files

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GitHub
Analysisdeepseek-v4-pro:cloud ·

Technical assessment

Python script that uploads a PHP webshell to vulnerable iCagenda Joomla instances via an unauthenticated file upload vulnerability, then executes arbitrary commands on the target.

Backdoor review

No backdoor observed in reviewed code

The supplied evidence consists of a README, a Python exploit script, and a requirements file for CVE-2026-48939. The script uploads a token-protected PHP webshell to a vulnerable iCagenda Joomla extension and executes commands on the target. All behavior is consistent with a standard proof-of-concept exploit for the described CVE. No concealed, deceptive, or operator-directed harmful behavior beyond the stated exploit was observed.

ClassificationExploit
Model confidence100%
AuthenticationNot required
Languagespython
Target softwareiCagenda Joomla extension
Attack typesarbitrary file uploadremote code execution
Evidence & reasoningClassification basis · observed behavior · safety review
Technical evidence

Classification basis and observed behavior

Classification basis

The artifact contains a complete Python script that actively exploits CVE-2026-48939 by uploading a PHP webshell and executing commands on the target. It is not limited to detection or scanning; it performs the full exploit chain.

cve_2026_48939.py:1-368README.md:8-9

Requirements

  • Target must be running a vulnerable version of the iCagenda Joomla extension (3.2.1-3.9.14 or 4.0.0-4.0.7).cve_2026_48939.py:130-139
  • Target must have the iCagenda registration.submit controller endpoint accessible.cve_2026_48939.py:32-35

Observed behavior

  • Detects iCagenda by fetching the XML manifest or checking for known paths.cve_2026_48939.py:99-128
  • Uploads a PHP webshell by POSTing to the registration.submit endpoint with a file in the jform[attachment] field.cve_2026_48939.py:143-203
  • Locates the uploaded shell by checking known destination paths and parsing directory listings.cve_2026_48939.py:170-197
  • Executes arbitrary system commands on the target via the deployed webshell.cve_2026_48939.py:216-223
  • Optionally cleans up the webshell by triggering a self-deletion command.cve_2026_48939.py:225-230
Safety-review evidence

Behaviors behind the backdoor verdict

Observables

Exploit Behavior
Uploads a PHP webshell to a target Joomla site and executes commands via HTTP GET parameters.This is the core functionality of the PoC and matches the described CVE-2026-48939 vulnerability.cve_2026_48939.py:143-203cve_2026_48939.py:216-223
Token Protection
The PHP webshell requires a random token for access and includes a self-deletion command.This limits unauthorized reuse of the deployed shell and is a common practice in responsible PoCs.cve_2026_48939.py:56-63
Cleanup Mechanism
The script includes a cleanup function that deletes the uploaded shell from the target.This is a responsible disclosure feature, not a backdoor.cve_2026_48939.py:225-230
Review boundaries

What the analysis did not establish

  • One file (unclassified_bytes: 70) was not provided as text; its content is unknown but unlikely to change classification given the complete exploit code in the provided files.
  • One file (metadata only) was omitted from the evidence; its content was not reviewed.
  • The review is based solely on the supplied text; no dynamic analysis was performed.
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