CVE-2026-3680 in biome-mcp-server
Summary
by MITRE • 03/08/2026
A security flaw has been discovered in RyuzakiShinji biome-mcp-server up to 1.0.0. Affected by this issue is some unknown functionality of the file biome-mcp-server.ts. Performing a manipulation results in command injection. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks. The patch is named 335e1727147efeef011f1ff8b05dd751d8a660be. Applying a patch is the recommended action to fix this issue.
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Analysis
by VulDB Data Team • 03/08/2026
The vulnerability identified as CVE-2026-3680 represents a critical command injection flaw within the RyuzakiShinji biome-mcp-server software version 1.0.0 and earlier. This security weakness resides in the biome-mcp-server.ts file, where improper input validation allows malicious actors to execute arbitrary commands on the affected system. The vulnerability's classification aligns with CWE-77 which specifically addresses command injection flaws that occur when user-supplied data is directly incorporated into system commands without adequate sanitization or escaping mechanisms. The remote exploitation capability of this vulnerability significantly amplifies its threat potential, as attackers can initiate malicious payloads from external networks without requiring local system access or authentication.
The technical implementation of this flaw demonstrates a classic command injection vector where user-controllable parameters are concatenated directly into shell commands without proper sanitization. This pattern creates an environment where attackers can manipulate input fields to inject malicious shell commands that will be executed with the privileges of the affected service. The vulnerability's exploitation requires minimal technical expertise since the patch has already been publicly released, indicating that threat actors have likely already developed and deployed working exploit code. This public availability of exploit code places organizations at heightened risk of automated attacks targeting vulnerable installations.
The operational impact of CVE-2026-3680 extends beyond simple command execution capabilities, potentially enabling full system compromise and lateral movement within network environments. Attackers could leverage this vulnerability to establish persistent access, exfiltrate sensitive data, deploy additional malware, or use the compromised system as a launch point for further attacks against adjacent systems. The attack surface is particularly concerning given that the vulnerability affects a server component that may be exposed to untrusted networks, making it a prime target for automated scanning and exploitation campaigns. Organizations running affected versions of the biome-mcp-server software face significant risk of unauthorized access and potential data breaches.
Mitigation of this vulnerability requires immediate application of the provided patch identified by the commit hash 335e1727147efeef011f1ff8b05dd751d8a660be. Security teams should prioritize patch deployment across all affected systems and conduct thorough inventory assessments to identify all instances of the vulnerable software. Additional defensive measures include implementing network segmentation to limit access to affected servers, monitoring for suspicious command execution patterns, and reviewing system logs for signs of exploitation attempts. The vulnerability's presence in a server component that handles potentially untrusted input data highlights the importance of following secure coding practices such as input validation, parameterized queries, and principle of least privilege. Organizations should also consider implementing intrusion detection systems that can identify and alert on command injection attempts, as this type of attack often follows predictable patterns that can be detected through behavioral analysis and signature-based detection mechanisms.