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CVE-2026-77516: MaxKB: Missing per-tool authorization in the agent and workflow tool-dispatch path

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-21 · updated 2026-09-28
• Weakness: CWE-639

Description

MaxKB is an open-source AI assistant for enterprise. From version 2.0.0 through 2.9.2, a lowest-role workspace member denied access to a tool by WorkspaceUserResourcePermission can still bind its identifier through tool_ids, skill_tool_ids, or mcp_tool_ids and execute it through the agent or workflow dispatch path. The dispatch path does not reapply the per-tool grant enforced by dedicated tool routes, and tool execution decrypts server-side init_params, allowing the caller to receive credentials carried by the denied tool. No fixed version is available as of this review.

Affected products

• 1Panel-dev MaxKB: from 2.0.0, <= 2.9.2

References

• https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-383v-fx78-pphm
• https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-383v-fx78-pphm

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