beecue FastBee IoT Platform Groovy Script Executor Remote Code Injection Vulnerability (CVE-2026-120274)
Executive & SecOps Summary
SECOPS ASSESSMENTbeecue FastBee up to version 2.1.0, specifically the /iot/script endpoint
A remote attacker with high privileges can inject arbitrary Groovy code, leading to unauthorized command execution and full system compromise
Apply the official patch commit (890a3384) or upgrade to the latest version, and restrict access to the script execution endpoint
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Apply the official patch commit (890a33846005a937a58cccd738b7fb9821b82ea9) or pull the latest secure version from the repository.
# Clone and apply the specific patch commit
git clone https://gitee.com/beecue/fastbee.git
cd fastbee
git cherry-pick 890a33846005a937a58cccd738b7fb9821b82ea9
# Or pull the latest stable release
git pull origin master2. Temporary Workaround & Hardening Configuration
If patching cannot be applied immediately, restrict external access to the vulnerable /iot/script endpoint using a reverse proxy like Nginx.
# Block external access to the vulnerable endpoint in Nginx
server {
listen 80;
server_name your-iot-domain.com;
location /iot/script {
deny all;
return 403;
}
}3. Log Audit & IoC Verification Commands
Inspect application logs for suspicious payloads or unauthorized access attempts targeting the /iot/script endpoint.
# Search logs for suspicious Groovy execution patterns and keywords
grep -riE '(/iot/script|Runtime\.getRuntime|ProcessBuilder|GroovyShell)' /var/log/fastbee/Block Exploits Instantly with Managed Virtual Patching Rules
Can't patch production immediately? Deploy managed WAF rules at the edge to intercept RCE, SQLi, and deserialization payloads before they hit your origin server.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
A code injection vulnerability (CWE-94, CWE-74) exists in the Groovy Script Executor component of the beecue FastBee IoT platform. The root cause is the lack of proper input validation and sandboxing on the /iot/script endpoint, allowing arbitrary Groovy code execution when processing user-supplied scripts.
2. Exploitation Mechanics & Attack Scenario
An attacker with high privileges (PR:H) can send a crafted HTTP POST request to the /iot/script endpoint. By embedding malicious Java/Groovy runtime commands (such as Runtime.getRuntime().exec()) within the payload, the attacker forces the backend server to execute arbitrary OS-level commands under the context of the application process.
3. Infrastructure & Business Impact
Successful exploitation of this vulnerability allows complete compromise of the host server running the FastBee platform. Attackers can leverage this access to pivot into internal networks, manipulate or exfiltrate sensitive IoT device telemetry data, or deploy ransomware, causing severe operational disruption.
Official Vendor Advisories & References
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.
Frequently Asked SecOps Questions (CVE-2026-120274)
FAQQ1. How critical is CVE-2026-120274 and is it actively exploited in the wild?
CVE-2026-120274 is rated CVSS 4.7 (MEDIUM) with a 30-day EPSS exploitation probability of 0.3%. Organizations running affected versions should prioritize patching based on network exposure.
Q2. Which vendors and products are affected by CVE-2026-120274?
Primary impacted vendors include beecue across fastbee. Scope summary: beecue FastBee up to version 2.1.0 (affecting the /iot/script endpoint of the Groovy Script Executor component)
Q3. What temporary mitigations or workarounds exist for CVE-2026-120274 before patching?
[Mitigation] Apply the official patch commit (890a3384) or upgrade to the latest version, and restrict access to the script execution endpoint Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
Generate an Internal Engineering Notice or CISO Report for CVE-2026-120274
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