CVE-2026-76761 in cc-connect
Summary
by MITRE • 08/20/2026
A vulnerability was identified in chenhg5 cc-connect up to 1.4.1. This affects the function shellExecCommand of the file core/engine.go of the component Management API. Such manipulation of the argument exec leads to os command injection. It is possible to launch the attack remotely. The exploit is publicly available and might be used. The reported GitHub issue was closed automatically due to inactivity.
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Analysis
by VulDB Data Team • 08/20/2026
The vulnerability identified within chenhg5 cc-connect versions up to 1.4.1 represents a critical security flaw located specifically within the Management API component, more precisely in the shellExecCommand function found in core/engine.go. This issue is classified as an operating system command injection vulnerability, which falls under the Common Weakness Enumeration category CWE-78. The root cause of this weakness lies in the improper neutralization of special elements used in an OS command, specifically through the exec argument passed to the shellExecCommand function. When user-supplied input or external data is directly concatenated into a system command without adequate sanitization or validation, it allows attackers to inject arbitrary commands that are executed with the privileges of the application process. This lack of input validation creates a direct pathway for malicious actors to compromise the underlying operating system hosting the service.
The operational impact of this vulnerability is severe due to its remote exploitability and the availability of public proof-of-concept exploits. Because the Management API typically handles administrative or configuration tasks, it often runs with elevated privileges on the host machine. An attacker who successfully leverages this command injection flaw can execute arbitrary system commands, leading to a complete compromise of the affected server. This could result in unauthorized access to sensitive data, modification or deletion of critical files, installation of backdoors for persistent access, and potentially using the compromised node as a pivot point to attack other systems within the network infrastructure. The fact that an exploit is publicly available significantly lowers the barrier to entry for attackers, increasing the likelihood of automated scanning and exploitation attempts against any instances running vulnerable versions.
From a threat intelligence perspective, this vulnerability aligns with several tactics in the MITRE ATT&CK framework. It primarily relates to Command and Scripting Interpreter techniques where adversaries use OS-level commands to execute actions on target systems. Specifically, it facilitates lateral movement if the compromised host is part of a larger cluster or network, as well as initial access through remote exploitation. The automatic closure of the associated GitHub issue due to inactivity highlights a common challenge in open-source project maintenance, where security reports may not receive timely attention from maintainers, leaving users exposed for extended periods. This situation underscores the importance of proactive vulnerability management and regular dependency audits in software development lifecycles.
To mitigate this risk, immediate action is required by upgrading chenhg5 cc-connect to a version newer than 1.4.1 where the shellExecCommand function has been patched with proper input validation and command parameterization techniques such as using execve or similar APIs that do not invoke a shell interpreter directly when possible. If an upgrade is not immediately feasible, organizations should implement network-level controls to restrict access to the Management API endpoint exclusively from trusted IP addresses via firewall rules or reverse proxy configurations. Additionally, deploying Web Application Firewalls with specific rule sets designed to detect and block command injection patterns can provide a layer of defense in depth. Continuous monitoring for unusual system processes spawned by the application process should also be implemented to detect potential exploitation attempts in real-time.