Rapid7

module

AVideo Encoder getImage.php Unauthenticated Command Injection

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Disclosed
Mar 5, 2026
Created
Mar 19, 2026

Description

This module exploits an unauthenticated OS command injection vulnerability
in AVideo Encoder's getImage.php endpoint (CVE-2026-29058).

The base64Url GET parameter is base64-decoded and injected directly into an
ffmpeg shell command within double quotes, without any sanitization or use of
escapeshellarg(). PHP's FILTER_VALIDATE_URL check does not block shell
metacharacters such as $() in the URL path, allowing command substitution.

A crafted URL like http://x/$(cmd) passes FILTER_VALIDATE_URL and is interpolated
into: ffmpeg -i "{$url}" ... resulting in arbitrary command execution as www-data.

The Encoder code is served by the main AVideo Apache container (mounted at
/Encoder), so exploitation gives access to the main application context including
database credentials and configuration.

Fixed in AVideo Encoder version 7.0 (commit 78178d1) which added escapeshellarg()
and shell metacharacter stripping.

Authors

arkmarta
Valentin Lobstein [email protected]

Platform

Linux,Unix

Architectures

cmd

References

Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':


    msf > use exploit/linux/http/avideo_encoder_getimage_cmd_injection
    msf exploit(avideo_encoder_getimage_cmd_injection) > show targets
        ...targets...
    msf exploit(avideo_encoder_getimage_cmd_injection) > set TARGET < target-id >
    msf exploit(avideo_encoder_getimage_cmd_injection) > show options
        ...show and set options...
    msf exploit(avideo_encoder_getimage_cmd_injection) > exploit
Title
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