CVE-2026-88755
Received Received - Intake

Arbitrary Code Execution in Z.ai ZCode

Publication date: 2026-10-16

Last updated on: 2026-10-16

Assigner: MITRE

Description
Z.ai ZCode v3.11.2.6792 was discovered to automatically establish connections with MCP servers declared inside a repository's workspace configuration, possibly allowing attackers to execute arbitrary code via opening a crafted repository.

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Meta Information

Published
2026-10-16
Last Modified
2026-10-16
Generated
2026-10-19
AI Q&A
2026-10-16
EPSS Evaluated
2026-10-18
NVD
CVE-2026-88755
EUVD
EUVD-2026-102905

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
n/a n/a n/a

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-284 The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
CWE-863 The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
CWE-78 The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

Attack-Flow Graph

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Executive Summary

CVE-2026-88755 is a vulnerability in Z.ai ZCode v3.11.2.6792 where the client automatically connects to MCP servers defined in a repository's workspace configuration without user approval. This allows attackers to execute arbitrary code by opening a crafted repository, bypassing security controls and enabling zero-interaction remote code execution.

Detection Guidance

Check ZCode client logs for unexpected MCP server connections or spawned processes like calc.exe. Monitor network traffic for outbound connections to unknown servers when opening repositories. Inspect .zcode/config.json files in repositories for suspicious MCP server entries.

Impact Analysis

This vulnerability can allow attackers to execute arbitrary code on your system without your knowledge by simply opening a malicious repository. It can also lead to information disclosure, such as exfiltration of sensitive credentials like API keys or passwords, as the client connects to attacker-controlled servers automatically.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR and HIPAA due to unauthorized code execution and information disclosure. Attackers may exfiltrate sensitive credentials like API keys, JWT tokens, and SSH passwords by exploiting the flaw, which violates data protection requirements under these regulations.

Mitigation Strategies

Disable automatic MCP server connections in ZCode settings if available. Avoid opening untrusted repositories in ZCode. Use network monitoring tools to block unauthorized outbound connections. Update ZCode to the latest version if a patch is released.

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