CVE-2026-77521

MaxKB: Prompt-injectable agent can lead to command execution

State: Published
Severity: 10.0 Critical
Published: Sep 21, 2026
Updated: Sep 22, 2026
Reserved: Aug 20, 2026

Description

MaxKB is an open-source AI assistant for enterprise. Prior to version 2.10.5-lts, assistants with a tool, MCP tool, skill, or sub-application use SandboxShellBackend, which exposes an execute shell tool without excluding it and omits execute from interrupt_on, so human approval is not required. Untrusted chat or ingested content can therefore cause command execution; source deployments with MAXKB_SANDBOX disabled run commands directly as the application user, while the official root container's string-based gosu wrapper allowed shell metacharacters to execute outside the intended sandbox. This issue is fixed in version 2.10.5-lts.

Scores

CVSS	Score	Vector	Source
3.1	10.0 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-250 Execution with Unnecessary Privileges
CWE-749 Exposed Dangerous Method or Function

Affected Products

Product	Versions
MaxKB1Panel-dev	< 2.10.5-ltsAffected

References

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