CVE-2026-1770: Crafter CMS Vulnerability Allows Remote Code Execution via Groovy Sandbox Bypass
Summary
CVE-2026-1770: Crafter CMS has Improper Control of Dynamically-Managed Code Resources. Affects org.craftercms:craftercms versions >= 4.0.0, < 4.5.0. Fixed in 4.5.0. How to fix ↓
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Background
Crafter CMS is a powerful content management system designed for creating and managing digital experiences. It offers features such as content modeling, versioning, and a flexible API for developers. However, it has been found to have a vulnerability in its Crafter Studio component, which allows authenticated developers to execute unauthorized OS commands due to improper control of dynamically-managed code resources.
Vulnerability Detail
The vulnerability arises from a flaw in the Groovy Sandbox implementation within Crafter Studio. Authenticated developers can exploit this flaw by inserting malicious Groovy elements, effectively bypassing the sandbox restrictions. This could lead to Remote Code Execution (RCE), allowing attackers to execute arbitrary OS commands on the server, potentially compromising the entire system and exposing sensitive data.
How To Fix
Latest published version: 4.3.2 as of 22 Oct 2026
Upgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.
If you need the minimum change
4.5.0
This is the first release that contains the fix.
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Workaround
As a temporary workaround, limit the permissions of authenticated developers to prevent them from executing Groovy scripts until the package can be updated. Additionally, consider implementing strict input validation to mitigate the risk of malicious code execution.
Conclusion
The vulnerability identified as CVE-2026-1770 in Crafter CMS poses a significant risk due to the potential for remote code execution. It is crucial to update to the patched version 4.5.0 or later to safeguard against this issue. Additionally, employing workarounds can help mitigate risks until an update can be applied.
See every vulnerability recorded for org.craftercms:craftercms →
FAQ
The CVSS score for this vulnerability is 4.5, indicating a moderate severity level.
Authenticated developers using Crafter CMS versions prior to 4.5.0 are affected by this vulnerability.
If exploited, an attacker could gain remote code execution capabilities, allowing them to execute arbitrary OS commands on the server.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without any signup.
If immediate updates are not possible, implement strict access controls and input validation as a temporary measure to mitigate risks.
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