CVE-2026-3066 Overview
A command injection vulnerability has been identified in HummerRisk, an open-source cloud security platform. This flaw affects the fixedCommand function within the file hummer-common/hummer-common-core/src/main/java/com/hummer/common/core/utils/PlatformUtils.java, which is part of the Cloud Compliance Scanning component. An authenticated attacker can exploit this vulnerability remotely by manipulating input parameters to inject arbitrary system commands.
Critical Impact
Remote attackers with low-level privileges can execute arbitrary commands on the underlying system through the Cloud Compliance Scanning feature, potentially compromising the entire cloud security infrastructure.
Affected Products
- HummerRisk versions up to and including 1.5.0
- HummerRisk Cloud Compliance Scanning component
- PlatformUtils.java in hummer-common-core module
Discovery Timeline
- 2026-02-24 - CVE-2026-3066 published to NVD
- 2026-02-24 - Last updated in NVD database
Technical Details for CVE-2026-3066
Vulnerability Analysis
The vulnerability exists in the fixedCommand function within the PlatformUtils.java file, which is responsible for handling command execution as part of the Cloud Compliance Scanning functionality. The flaw arises from improper input validation and sanitization, allowing attackers to inject malicious commands that get executed with the privileges of the application.
HummerRisk is designed to provide cloud security compliance scanning across various cloud environments. The affected component processes user-supplied input to construct system commands, but fails to adequately neutralize special elements that could be interpreted as command separators or shell metacharacters. This is classified under CWE-74 (Improper Neutralization of Special Elements in Output) and CWE-77 (Command Injection).
The attack can be launched remotely over the network, requiring only low-level privileges to access the vulnerable functionality. No user interaction is required, making this a viable target for automated attacks. The exploit has been publicly disclosed, increasing the risk of widespread exploitation.
Root Cause
The root cause of this vulnerability is insufficient input validation in the fixedCommand function. The function constructs shell commands using user-controllable input without properly sanitizing or escaping special characters. This allows attackers to break out of the intended command context and inject additional commands using shell metacharacters such as semicolons, pipes, backticks, or command substitution syntax.
Attack Vector
The vulnerability is exploitable via network access to the HummerRisk platform. An authenticated attacker with low privileges can submit specially crafted input to the Cloud Compliance Scanning feature. The malicious payload is processed by the fixedCommand function, which fails to properly sanitize the input before incorporating it into a system command execution call. This allows the attacker to append or inject arbitrary commands that execute on the server with application-level privileges.
The attack scenario typically involves:
- Authenticating to the HummerRisk platform with basic user credentials
- Accessing the Cloud Compliance Scanning functionality
- Injecting command separators and malicious commands into vulnerable input fields
- Achieving arbitrary command execution on the underlying server
Due to the sensitive nature of cloud security platforms, successful exploitation could provide attackers access to cloud credentials, security configurations, and the ability to manipulate compliance scanning results.
Detection Methods for CVE-2026-3066
Indicators of Compromise
- Unusual command execution patterns in process monitoring logs on HummerRisk servers
- Unexpected child processes spawned from the Java application process
- Anomalous network connections originating from the HummerRisk application server
- Suspicious entries in application logs related to Cloud Compliance Scanning operations
Detection Strategies
- Monitor process execution on HummerRisk servers for unexpected shell commands or interpreter invocations
- Implement Web Application Firewall (WAF) rules to detect command injection patterns in HTTP requests
- Analyze application logs for malformed or suspicious Cloud Compliance Scanning requests
- Deploy intrusion detection signatures targeting common command injection payloads
Monitoring Recommendations
- Enable verbose logging for the Cloud Compliance Scanning component
- Configure SIEM rules to alert on process execution anomalies from Java applications
- Monitor for unusual file system access patterns on HummerRisk servers
- Track outbound network connections from application servers for potential data exfiltration
How to Mitigate CVE-2026-3066
Immediate Actions Required
- Restrict network access to HummerRisk instances to trusted administrative networks only
- Implement additional input validation at the network perimeter using WAF rules
- Review and audit all user accounts with access to Cloud Compliance Scanning features
- Consider temporarily disabling the Cloud Compliance Scanning functionality until patched
Patch Information
No official patch has been released by the vendor at this time. According to the disclosure, the vendor was contacted early about this vulnerability but did not respond. Organizations using HummerRisk should monitor the official GitHub Issue Discussion and vendor channels for security updates. Additional technical details are available through VulDB #347417.
Workarounds
- Implement strict network segmentation to isolate HummerRisk instances from untrusted networks
- Deploy a Web Application Firewall with command injection detection rules in front of HummerRisk
- Restrict user privileges and minimize the number of accounts with access to scanning features
- Consider implementing custom input validation at the reverse proxy level to filter malicious payloads
# Example WAF rule pattern for command injection detection
# Add to your reverse proxy or WAF configuration
SecRule ARGS "@rx [;|`$&><]" "id:1001,phase:2,deny,status:403,msg:'Command Injection Attempt Blocked'"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
