Vulnerability 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.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/1Panel-dev/MaxKB/commit/594f50f2ea80a502d1c955371ba0438b277c3
- https://github.com/1Panel-dev/MaxKB/releases/tag/v2.10.5-lts
- https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-f36j-f34j-h3rx
- https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-f36j-f34j-h3rx
FAQ
What is CVE-2026-77521?
CVE-2026-77521 is a vulnerability with a CVSS score of 10.0 (CRITICAL). 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 to...
How severe is CVE-2026-77521?
CVE-2026-77521 has been rated CRITICAL with a CVSS base score of 10.0/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-77521?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.