CVE-2026-63305 in AVideo
Summary
by MITRE • 07/16/2026
AVideo through 29.0 contains an OS command injection vulnerability in the ffmpeg.json.php endpoint where notifyCode and callback parameters are concatenated into a shell command without escaping. Attackers who can craft a valid encrypted payload can inject arbitrary shell metacharacters into these fields to execute OS commands as the web-server user.
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Analysis
by VulDB Data Team • 07/16/2026
This vulnerability exists within Video through version 29.0 where the ffmpeg.json.php endpoint fails to properly sanitize user input parameters notifyCode and callback before incorporating them into shell commands. The flaw represents a classic os command injection vulnerability that allows remote attackers to execute arbitrary operating system commands with the privileges of the web server process. The vulnerability stems from improper input validation and sanitization practices where attacker-controlled data flows directly into shell execution contexts without adequate escaping or encoding mechanisms.
The technical implementation of this vulnerability leverages the fact that the application constructs shell commands by concatenating user-supplied values from notifyCode and callback parameters without proper shell metacharacter escaping. This creates an environment where attackers can inject malicious shell syntax such as semicolons, ampersands, or other command separators that would cause the system to execute additional unintended commands. When combined with the ability to craft valid encrypted payloads, this vulnerability becomes particularly dangerous as it allows for authenticated exploitation of the command injection flaw.
Operationally this vulnerability presents a severe risk to affected systems as it enables full command execution capabilities from remote attackers who can submit crafted requests to the vulnerable endpoint. The impact extends beyond simple code execution to potentially allow privilege escalation, data exfiltration, system compromise, and lateral movement within the network environment. Since the commands execute with web server privileges, attackers may gain access to sensitive files, database connections, or other system resources that are normally protected from direct user access. This vulnerability directly maps to CWE-78 which specifically addresses OS Command Injection flaws in software applications.
The exploitation of this vulnerability aligns with several attack patterns documented in the mitre ATT&CK framework under techniques such as command and control communications and privilege escalation. Attackers can leverage this flaw to establish persistent access, deploy additional malware, or pivot to other systems within the network infrastructure. The encrypted payload requirement adds a layer of sophistication to the attack vector but does not mitigate the underlying security flaw that enables the command injection.
Mitigation strategies should focus on implementing proper input validation and sanitization for all user-supplied parameters before they are processed by shell commands. The recommended approach involves escaping or encoding special shell metacharacters, implementing strict parameter validation, and using secure coding practices that avoid direct shell command construction from user input. Organizations should also consider implementing web application firewalls to detect and block suspicious payload patterns, conducting regular security assessments of third-party components, and applying immediate patches when available. Additionally, privilege separation techniques should be implemented to ensure that web server processes operate with minimal necessary permissions, reducing the potential impact of successful exploitation attempts.