{"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":0.62809,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"total","timestamp":"2026-09-22T13:31:58.194506Z"},"ingestedAt":"2026-09-21T20:52:58.291Z","slug":"CVE-2026-77521","body":"## Overview\n\nMaxKB 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"abyssal","depthScore":67,"depthScoreParts":{"impact":55,"likelihood":0.2,"exploitation":12,"ransomware":0},"changes":[{"seq":209058,"id":"CVE-2026-77521","ts":1790085894699,"field":"exploit_available","old":"false","new":"true"}]}