CVE-2026-30309: InfCode Terminal Auto-Exec RCE Flaw

CVE-2026-30309 Overview

InfCode's terminal auto-execution module contains a critical command filtering vulnerability that renders its blacklist security mechanism completely ineffective. The predefined blocklist fails to cover native high-risk commands in Windows PowerShell (such as powershell), and the matching algorithm lacks dynamic semantic parsing, making it unable to recognize string concatenation, variable assignment, or double-quote interpolation in Shell syntax. Malicious commands can bypass interception through simple syntax obfuscation.

An attacker can construct a file containing malicious instructions for remote code injection. When a user imports and views such a file in the IDE, the Agent executes dangerous PowerShell commands outside the blacklist without user confirmation, resulting in arbitrary command execution or sensitive data leakage.

Critical Impact

This command injection vulnerability allows attackers to execute arbitrary PowerShell commands through crafted project files, bypassing security controls entirely when users open malicious files in the InfCode IDE.

Affected Products

• InfCode IDE (terminal auto-execution module)
• InfCode Agent component with terminal integration
• Systems running InfCode with PowerShell environments

Discovery Timeline

• 2026-03-31 - CVE-2026-30309 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2026-30309

Vulnerability Analysis

This vulnerability is classified as CWE-78 (Improper Neutralization of Special Elements used in an OS Command), commonly known as OS Command Injection. The fundamental flaw lies in InfCode's terminal auto-execution module's inadequate command filtering implementation.

The security mechanism relies on a static blacklist approach to prevent execution of dangerous commands. However, this approach is inherently flawed for several reasons:

1. Incomplete Coverage: The predefined blocklist does not include critical Windows PowerShell commands such as powershell, pwsh, or related executables
2. Static Pattern Matching: The filtering algorithm uses simple string matching rather than dynamic semantic parsing
3. Syntax Obfuscation Blindness: The filter cannot recognize equivalent malicious commands when obfuscated through string concatenation, variable assignment, or shell interpolation techniques

The attack requires local access and user interaction—specifically, the victim must import and view a maliciously crafted file within the InfCode IDE. Once this condition is met, the Agent component automatically executes commands embedded in the file without requesting user confirmation.

Root Cause

The root cause is the reliance on an inadequate blacklist-based security model combined with a naive string-matching algorithm. The command filter implementation fails to account for the rich syntax capabilities of modern shells like PowerShell, which support numerous ways to obfuscate command strings while maintaining functional equivalence.

Key deficiencies include:

• Missing coverage for PowerShell-native commands in the blocklist
• No semantic analysis of command structures
• Inability to parse and normalize shell syntax variations
• Lack of user confirmation prompts before executing terminal commands

Attack Vector

The attack vector requires local access with user interaction. An attacker crafts a malicious project file or configuration that embeds obfuscated PowerShell commands. When a victim opens this file in InfCode IDE, the terminal auto-execution module parses and executes the embedded commands.

Attackers can leverage various obfuscation techniques to bypass the blacklist:

• String concatenation: Breaking command names into multiple string literals
• Variable assignment: Storing command fragments in variables before execution
• Double-quote interpolation: Using shell variable expansion within quoted strings
• Encoding techniques: Base64 or other encoding methods to mask command intent
• Command aliasing: Using alternative command names or aliases not in the blocklist

The successful exploitation results in arbitrary command execution with the privileges of the InfCode process, potentially leading to system compromise or exfiltration of sensitive data. For detailed technical analysis, refer to the GitHub Issue Discussion.

Detection Methods for CVE-2026-30309

Indicators of Compromise

• Unexpected PowerShell process spawning from InfCode IDE or Agent processes
• Presence of obfuscated command strings in project files or workspace configurations
• Unusual network connections initiated by InfCode-related processes
• Evidence of command execution in PowerShell logs without corresponding user-initiated actions

Detection Strategies

• Monitor process creation events for PowerShell instances spawned as child processes of InfCode
• Implement file integrity monitoring on project workspaces for suspicious embedded scripts
• Enable PowerShell Script Block Logging to capture deobfuscated command content
• Configure endpoint detection to alert on command obfuscation patterns in file content

Monitoring Recommendations

• Enable Windows Event Log auditing for process creation (Event ID 4688) with command-line logging
• Configure PowerShell Module Logging and Script Block Logging via Group Policy
• Deploy SentinelOne Singularity XDR to detect behavioral anomalies in IDE processes
• Establish baseline behavior for InfCode processes and alert on deviations

How to Mitigate CVE-2026-30309

Immediate Actions Required

• Review and restrict terminal auto-execution features in InfCode settings until a patch is available
• Avoid opening untrusted project files or workspaces in InfCode IDE
• Implement application whitelisting to control which processes can spawn PowerShell
• Enable PowerShell Constrained Language Mode where feasible to limit script capabilities

Patch Information

Consult the Tokfinity InfCode product page for official security updates and patched versions. Monitor vendor communications for patch release announcements addressing this command filtering vulnerability.

Workarounds

• Disable the terminal auto-execution feature in InfCode configuration until an official patch is released
• Implement network segmentation to limit potential lateral movement if exploitation occurs
• Use endpoint protection solutions like SentinelOne to detect and block suspicious command execution patterns
• Educate users about the risks of opening project files from untrusted sources

# PowerShell Constrained Language Mode (temporary mitigation)
# Set via Group Policy or environment variable
$ExecutionContext.SessionState.LanguageMode = "ConstrainedLanguage"

# Enable Script Block Logging via registry
Set-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows\PowerShell\ScriptBlockLogging" -Name "EnableScriptBlockLogging" -Value 1