CVE-2026-33482CWE-78

AVideo has an OS Command Injection via $() Shell Substitution Bypass in sanitizeFFmpegCommand()

High · published March 23, 2026

CVSS v3.1
8.1
EPSS
5%
Percentile
92.0
In the wild
Unconfirmed
What it is

WWBN AVideo is an open source video platform. In versions up to and including 26.0, the `sanitizeFFmpegCommand()` function in `plugin/API/standAlone/functions.php` is designed to prevent OS command injection in ffmpeg commands by stripping dangerous shell metacharacters (`&&`, `;`, `|`, `` ` ``, `<`, `>`). However, it fails to strip `$()` (bash command substitution syntax). Since the sanitized command is executed inside a double-quoted `sh -c` context in `execAsync()`, an attacker who can craft a valid encrypted payload can achieve arbitrary command execution on the standalone encoder server. Commit 25c8ab90269e3a01fb4cf205b40a373487f022e1 contains a patch.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.04833 · 92.0th percentile
Weakness
CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Published
2026-03-23T14:10Z
EPSS history
Timeline
  • 23 MAR 14:10Z
    AVideo has an OS Command Injection via $() Shell Substitution Bypass in sanitizeFFmpegCommand()
    cvelistv5