# CVE-2026-77520: MaxKB authorization bypass in application discovery and invocation

Source: https://junglewise.ai/threats/cve-2026-77520-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-2026-77520 · Severity: medium · CVSS 5.4 · Published 2026-09-21

MaxKB is an open-source AI assistant platform for enterprises. A low-privileged user can discover other users' private application identifiers through an unprotected endpoint, then embed those identifiers in their own workflow to trigger the victim's application and capture its responses, bypassing normal access controls. This allows unauthorized interaction with victim applications and creation of audit trail entries under victims' accounts.

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

## Quick answers

**Is CVE-2026-77520 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-77520 being exploited in the wild.

**How severe is CVE-2026-77520?** 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-2026-77520?** 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-2026-77520 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-77520?** 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 combines two authorization flaws: the homepage ranking endpoint leaks application_ids from other users' published applications based on name filtering, and workflow application-node execution does not verify permission to invoke referenced applications. An authenticated workspace user can query /homepage/application/question_ranking with a victim application name to obtain the application_id, then save a workflow containing an application-node referencing that id, and trigger it to receive the victim application's output and create chat records under the victim account. No permission checks protect the save path or runtime execution path against cross-user application invocation.

## Affected products

- 1Panel-dev MaxKB 2.10.2-lts and earlier

## Timeline

- 2026-09-21: disclosed: Security advisory published (GHSA-4w4r-h4x8-mg7h)
- 2026-09-02: other: GitHub security advisory published

## References

- [https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-4w4r-h4x8-mg7h](https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-4w4r-h4x8-mg7h)

## 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 expired application API keys remain usable on MCP endpoint](https://junglewise.ai/threats/cve-2026-77519-maxkb-is-an-open-source-ai-assistant-for-enterprise-in-2-10-2-lts)