---
id: CVE-2026-77521
title: MaxKB is an open-source AI assistant for enterprise
summary: >-
  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 exe…
severity: critical
cvss: 10
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-78
  - CWE-250
  - CWE-749
vendor: 1Panel-dev
product: MaxKB
affected:
  - MaxKB < 2.10.5-lts
published: '2026-09-21'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T14:17:15.343'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77521'
references:
  - url: >-
      https://github.com/1Panel-dev/MaxKB/commit/594f50f2ea80a502d1c955371ba0438b277c30ea
    label: security-advisories@github.com
  - url: 'https://github.com/1Panel-dev/MaxKB/releases/tag/v2.10.5-lts'
    label: security-advisories@github.com
  - url: >-
      https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-f36j-f34j-h3rx
    label: security-advisories@github.com
  - url: >-
      https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-f36j-f34j-h3rx
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.01049
epssPercentile: 0.62832
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-22T13:31:58.194506Z'
ingestedAt: '2026-09-21T20:52:58.291Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.