EUVD-2026-22162Severity by source
AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L
Lifecycle Timeline
6DescriptionGitHub Advisory
MaxKB is an open-source AI assistant for enterprise. Versions 2.7.1 and below contain an incomplete fix for CVE-2025-53928, where a Remote Code Execution vulnerability still exists in the MCP node of the workflow engine. MaxKB only restricts the referencing code path (loading MCP config from the database). The else branch, responsible for loading mcp_servers directly from user-supplied JSON remains completely unpatched. Since mcp_source is an optional field (required=False), an attacker can simply omit it or set it to any non-referencing value to bypass the fix. By calling the workflow creation API directly with a crafted JSON payload, an attacker can inject a complete MCP node configuration with stdio transport, arbitrary command, and args - achieving RCE when the workflow is triggered via chat. This issue has been fixed in version 2.8.0.
AnalysisAI
Remote code execution in MaxKB workflow engine (versions 2.7.1 and below) allows authenticated users to bypass an incomplete CVE-2025-53928 fix by injecting arbitrary MCP node configurations through the workflow creation API. An attacker with low-privilege credentials can omit the mcp_source field to trigger the unpatched else branch, inject stdio transport with arbitrary commands, and achieve RCE when the workflow is executed via chat interaction. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Risk Assessment | This vulnerability presents moderate real-world risk despite the low CVSS score (4.6). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A low-privilege user of MaxKB (or an attacker with compromised low-privilege credentials) crafts a workflow creation request to the API with a JSON payload containing an MCP node where mcp_source is omitted and mcp_servers includes a stdio-based command (e.g., invoking a reverse shell or data exfiltration script). The attacker saves this workflow and triggers it via the chat interface by asking a question that invokes the workflow. … |
| Remediation | Upgrade MaxKB immediately to version 2.8.0 or later, which includes the complete fix for this vulnerability (confirmed via GitHub commit 50e96002ee5dca34c68d3d9333b64ea358c92304). … Detailed patch versions, workarounds, and compensating controls in full report. |
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