1Panel-dev MaxKB up to 2.10.5-lts SandboxShellBackend os command injection

Summaryinfo

A vulnerability was found in 1Panel-dev MaxKB up to 2.10.5-lts and classified as very critical. The impacted element is an unknown function of the component SandboxShellBackend. Such manipulation leads to os command injection. This vulnerability is uniquely identified as CVE-2026-77521. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in 1Panel-dev MaxKB up to 2.10.5-lts and classified as very critical. Affected by this issue is an unknown code of the component SandboxShellBackend. The manipulation with an unknown input leads to a os command injection vulnerability. Using CWE to declare the problem leads to CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-77521 since 08/20/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/21/2026). The MITRE ATT&CK project declares the attack technique as T1202.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• 1Panel-dev

Name

• MaxKB

Version

• 2.10.5-lts

Website

• Product: https://github.com/1Panel-dev/MaxKB/

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