CVE-2026-6837 in WAX650S
Summary
by MITRE • 08/04/2026
A post-authentication command injection vulnerability in the "export-cgi" CGI program in Zyxel WAX650S firmware versions through 7.10(ABRM.4)C0 could allow an authenticated attacker with administrator privileges to execute OS commands on an affected device.
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Analysis
by VulDB Data Team • 08/04/2026
This vulnerability represents a critical post-authentication command injection flaw in the Zyxel WAX650S wireless access point firmware, specifically within the export-cgi CGI program component. The issue arises from insufficient input validation and sanitization mechanisms that fail to properly escape or filter user-supplied data before incorporating it into system commands. Attackers with administrator credentials can exploit this weakness by crafting malicious inputs that bypass normal command parsing and execution boundaries, effectively gaining unauthorized operating system-level access to the affected device.
The technical implementation of this vulnerability stems from improper handling of CGI parameters within the export-cgi script, which directly incorporates user-provided data into shell commands without adequate sanitization. This pattern aligns with common command injection vulnerabilities classified under CWE-77 and CWE-88, where external input is improperly integrated into command execution contexts. The attack vector requires an authenticated session with administrative privileges, making it less likely to be exploited by casual attackers but still poses significant risk to organizations where administrative credentials may be compromised or where insider threats exist.
The operational impact of this vulnerability extends beyond simple unauthorized command execution, as it enables full system compromise of the affected wireless access point. An attacker could potentially escalate privileges further, modify network configurations, establish persistence mechanisms, or use the device as a pivot point for attacking other systems within the network perimeter. This represents a serious security degradation that undermines the integrity and confidentiality of the wireless infrastructure, particularly in enterprise environments where such devices serve as critical network components.
Organizations should immediately implement mitigations including firmware updates to versions beyond 7.10(ABRM.4)C0 where available, network segmentation to limit access to administrative interfaces, and enhanced monitoring for suspicious authentication patterns. The vulnerability demonstrates the importance of proper input validation and secure coding practices in web applications and CGI scripts, as outlined in the OWASP Top Ten and MITRE ATT&CK framework under techniques related to command injection and privilege escalation. Regular security assessments of network infrastructure components remain essential to identify similar vulnerabilities that could provide attackers with unauthorized access to critical systems.