CVE-2026-120274 in FastBee
Summary
by MITRE • 11/01/2026
A vulnerability was identified in beecue FastBee up to 2.1.0. Affected by this issue is some unknown functionality of the file /iot/script of the component Groovy Script Executor. The manipulation leads to code injection. The attack is possible to be carried out remotely. The identifier of the patch is 890a33846005a937a58cccd738b7fb9821b82ea9. It is suggested to install a patch to address this issue.
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Analysis
by VulDB Data Team • 11/02/2026
The vulnerability identified in beecue FastBee versions up to 2.1.0 represents a critical security flaw within the Groovy Script Executor component, specifically affecting the /iot/script endpoint. This functionality allows for the execution of scripts written in the Groovy programming language, which is commonly used in IoT platforms for automation and device management tasks. The core technical issue stems from insufficient input validation and sanitization mechanisms when processing user-supplied data passed to this script executor. As a result, an attacker can inject malicious code into the script payload, leading to arbitrary command execution on the underlying system hosting the FastBee instance. This type of flaw is classically categorized under CWE-94 Improper Control of Generation of Code or Script, often referred to as code injection. The lack of strict sandboxing or context-aware parsing allows external inputs to break out of intended script boundaries and execute operating system commands directly through the Groovy runtime environment.
The operational impact of this vulnerability is severe due to its remote exploitability. Since the attack vector is network-based, a threat actor does not need physical access or prior authentication credentials if the /iot/script endpoint is exposed without adequate access controls. Even with some level of authentication, the ability to inject and execute arbitrary code effectively compromises the confidentiality, integrity, and availability of the affected system. An attacker could leverage this flaw to escalate privileges, exfiltrate sensitive IoT configuration data, install backdoors, or pivot into other parts of the internal network. In an industrial or smart home context, compromising the server running FastBee can lead to unauthorized control over connected devices, potentially causing physical damage or operational disruption depending on the nature of the controlled hardware.
From a threat intelligence perspective, this vulnerability aligns with MITRE ATT&CK techniques related to Command and Scripting Interpreter abuse, specifically T1059 which covers various scripting languages including Groovy. The exploitation path typically involves crafting a malicious script payload that bypasses any existing filters or logic checks within the application layer before reaching the interpreter engine. This allows for lateral movement if the compromised server serves as a gateway to other network segments. The persistence of this risk is significant because IoT platforms often run with elevated privileges to manage hardware interfaces, thereby amplifying the potential damage once code execution is achieved.
To mitigate this vulnerability, it is imperative to apply the patch identified by commit hash 890a33846005a937a58cccd738b7fb9821b82ea9 as soon as possible. This update likely introduces stricter input validation, enhanced sandboxing for script execution, or removal of the direct script injection capability in favor of safer API endpoints. In addition to patching, organizations should implement network-level controls such as firewalls and intrusion detection systems to restrict access to the /iot/script endpoint only from trusted IP addresses. Furthermore, adopting a principle of least privilege ensures that even if an exploit occurs, the damage is contained by limiting the permissions granted to the FastBee service account. Regular security audits and penetration testing focused on script injection vulnerabilities are recommended to maintain robust defense-in-depth strategies for IoT infrastructure.