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CVE-2026-77521

10.0 · CRITICAL

MaxKB is an open-source AI assistant for enterprise.

Published Sep 21, 2026CWE-78EPSS 1.05%

Overview

CVE-2026-77521 is a critical-severity vulnerability. It was published on September 21, 2026 and has a CVSS 3.1 base score of 10.0 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/1Panel-dev/MaxKB/commit/594f50f2ea80a502d1c955371ba0438b277c30eaGitHubgithub.com/1Panel-dev/MaxKB/releases/tag/v2.10.5-ltsGitHubgithub.com/1Panel-dev/MaxKB/security/advisories/GHSA-f36j-f34j-h3rxGitHubgithub.com/1Panel-dev/MaxKB/security/advisories/GHSA-f36j-f34j-h3rx

How CyberStrike helps

Frequently asked questions

What is CVE-2026-77521?

CVE-2026-77521 is a critical-severity vulnerability. It was published on September 21, 2026 and has a CVSS 3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2026-77521?

This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-77521?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-77521?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-77521 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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