CVE-2026-1770 Overview
CVE-2026-1770 is an Improper Control of Dynamically-Managed Code Resources vulnerability (CWE-913) in Crafter Studio, a component of Crafter CMS. This flaw allows authenticated developers to execute arbitrary OS commands by bypassing the Groovy sandbox security restrictions. Through the insertion of malicious Groovy elements, an attacker with developer-level access can achieve Remote Code Execution (RCE) on the underlying server.
Critical Impact
Authenticated developers can bypass Groovy sandbox restrictions to execute arbitrary OS commands, potentially leading to full system compromise.
Affected Products
- Crafter CMS (Crafter Studio component)
Discovery Timeline
- 2026-02-02 - CVE CVE-2026-1770 published to NVD
- 2026-02-03 - Last updated in NVD database
Technical Details for CVE-2026-1770
Vulnerability Analysis
This vulnerability stems from improper control of dynamically-managed code resources within Crafter Studio's Groovy scripting implementation. Crafter CMS allows developers to write Groovy scripts to extend platform functionality. To prevent malicious code execution, these scripts are intended to run within a restricted sandbox environment.
However, the sandbox implementation contains security flaws that allow specially crafted Groovy code to escape the sandbox restrictions. Once an attacker bypasses the sandbox, they gain the ability to execute arbitrary operating system commands with the privileges of the Crafter CMS application process.
The attack requires authentication with developer-level privileges, which limits the attack surface but still presents a significant risk in multi-tenant environments or scenarios where developer accounts may be compromised.
Root Cause
The root cause of CVE-2026-1770 is the inadequate implementation of sandbox restrictions for Groovy script execution in Crafter Studio. The sandbox fails to properly restrict certain Groovy language features and Java class access, allowing attackers to construct malicious payloads that bypass the intended security controls. This is classified under CWE-913 (Improper Control of Dynamically-Managed Code Resources).
Attack Vector
The attack is executed over the network by an authenticated user with developer privileges. The attacker crafts malicious Groovy script elements designed to exploit weaknesses in the sandbox implementation. When these scripts are executed by the Crafter Studio component, they escape the sandbox and execute arbitrary commands on the host operating system.
The vulnerability manifests when malicious Groovy elements are processed by Crafter Studio's script execution engine. The sandbox bypass technique allows attackers to invoke dangerous Java classes and methods that would normally be restricted. For detailed technical information and proof-of-concept details, refer to the Crafter CMS Security Advisory.
Detection Methods for CVE-2026-1770
Indicators of Compromise
- Unusual Groovy script submissions or modifications in Crafter Studio by developer accounts
- Unexpected process spawning from the Crafter CMS application server
- Anomalous outbound network connections originating from the CMS server
- System commands or shell invocations appearing in application logs
Detection Strategies
- Monitor Crafter Studio logs for suspicious Groovy script execution patterns
- Implement application-level logging to capture all script modifications and executions
- Deploy endpoint detection and response (EDR) solutions to identify post-exploitation activities
- Review audit logs for unusual developer account activity or privilege abuse
Monitoring Recommendations
- Enable verbose logging for Groovy script execution within Crafter Studio
- Configure alerting for script modifications performed outside normal business hours
- Monitor system process trees for child processes spawned by the Crafter CMS service
- Implement network traffic analysis to detect command-and-control communications
How to Mitigate CVE-2026-1770
Immediate Actions Required
- Review and apply the latest security patches from Crafter CMS as detailed in the security advisory
- Audit all developer accounts and remove unnecessary privileges
- Review recent Groovy script modifications for suspicious content
- Implement additional access controls to limit who can create or modify Groovy scripts
Patch Information
Crafter CMS has released security guidance addressing this vulnerability. Administrators should consult the Crafter CMS Security Advisory for specific patch information and remediation steps. Apply all available updates to Crafter Studio as soon as possible.
Workarounds
- Restrict developer account access to only trusted personnel
- Implement code review processes for all Groovy script submissions before deployment
- Consider disabling or limiting Groovy scripting capabilities if not required for operations
- Deploy network segmentation to isolate CMS servers from critical infrastructure
# Configuration example
# Restrict Groovy script permissions in Crafter Studio configuration
# Consult Crafter CMS documentation for specific configuration options
# Example: Limit script execution to specific directories
# crafter.security.script.restrictedPaths=/scripts/approved/*
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
