What’s Vulnerable › Vulnerabilities

CVE-2026-77521: MaxKB: Prompt-injectable agent can lead to command execution

• Severity: critical (CVSS 10.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-21 · updated 2026-09-22
• Weakness: CWE-78

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.

Affected products

• 1Panel-dev MaxKB: before 2.10.5-lts

References

• https://github.com/1Panel-dev/MaxKB/commit/594f50f2ea80a502d1c955371ba0438b277c30ea
• 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

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