CVE-2026-77521: 1panel-Dev Maxkb

Critical severity, CVSS 10.0. EPSS: 1% chance of exploitation in the next 30 days.

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.

Affected products

• 1panel-Dev Maxkb: before 2.10.5-lts (fixed in 2.10.5-lts)

Published 2026-09-21. Last modified 2026-09-22.