# CVE-2026-77519: MaxKB expired application API keys remain usable on MCP endpoint

Source: https://junglewise.ai/threats/cve-2026-77519-maxkb-is-an-open-source-ai-assistant-for-enterprise-in-2-10-2-lts  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-21. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-77519 · Severity: medium · CVSS 5.4 · Published 2026-09-21

MaxKB is an open-source AI assistant platform for enterprises. The /chat/api/mcp endpoint accepts expired application API keys that the standard chat API correctly rejects, allowing an attacker with a formerly valid key to invoke tools and create permanent chat records even after the key has expired. This bypasses intended access controls on published applications.

Technologies: [1Panel-dev MaxKB](https://junglewise.ai/threats/technologies/maxkb). Vendors: [1Panel-dev](https://junglewise.ai/threats/vendors/1panel-dev).

## Quick answers

**Is CVE-2026-77519 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-77519 being exploited in the wild.

**How severe is CVE-2026-77519?** Medium severity, with a CVSS score of 5.4, published 21 September 2026.

**Which products and versions are affected?** 1Panel-dev MaxKB 2.10.2-lts and earlier.

**Is there a fix for CVE-2026-77519?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-77519 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-77519?** Check whether you run 1Panel-dev MaxKB at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an authentication bypass in the MCP (Model Context Protocol) endpoint caused by inconsistent expiration checking. While the standard chat API validates is_permanent and expire_time flags before granting access, the /chat/api/mcp endpoint only checks the API key's secret and is_active status. An attacker with a non-permanent application API key that has passed its expiration time can still initialize the MCP endpoint, list tool metadata, invoke tool execution, and create durable application_chat records—all actions denied by the standard chat route.

## Affected products

- 1Panel-dev MaxKB 2.10.2-lts and earlier

## Timeline

- 2026-09-21: disclosed
- 2026-09-02: advisory: GitHub security advisory GHSA-r6g6-69fh-c39q published

## References

- [https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-r6g6-69fh-c39q](https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-r6g6-69fh-c39q)

## Related threats

- [MaxKB chat-record routes authorization bypass in management API](https://junglewise.ai/threats/cve-2026-77525-maxkb-is-an-open-source-ai-assistant-for-enterprise-in-2-10-2-lts)
- [MaxKB cross-workspace model parameter form write](https://junglewise.ai/threats/cve-2026-77523-maxkb-is-an-open-source-ai-assistant-for-enterprise-in-version-2)
- [MaxKB knowledge web-document crawler server-side request forgery](https://junglewise.ai/threats/cve-2026-77522-maxkb-is-an-open-source-ai-assistant-for-enterprise-in-version-2)
- [MaxKB command execution in SandboxShellBackend](https://junglewise.ai/threats/cve-2026-77521-maxkb-is-an-open-source-ai-assistant-for-enterprise-prior-to)
- [MaxKB authorization bypass in application discovery and invocation](https://junglewise.ai/threats/cve-2026-77520-maxkb-is-an-open-source-ai-assistant-for-enterprise-in-2-10-2-lts)