# CVE-2026-77523: MaxKB cross-workspace model parameter form write

Source: https://junglewise.ai/threats/cve-2026-77523-maxkb-is-an-open-source-ai-assistant-for-enterprise-in-version-2  
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-2026-77523 · Severity: high · CVSS 7.4 · Published 2026-09-21

MaxKB is an open-source AI assistant platform that stores configuration parameters for language models. An authenticated attacker can exploit a missing authorization check to read or overwrite model parameter defaults belonging to other workspaces, potentially poisoning model settings that affect workflows and outputs across the platform.

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

## Quick answers

**Is CVE-2026-77523 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-77523 being exploited in the wild.

**How severe is CVE-2026-77523?** High severity, with a CVSS score of 7.4, published 21 September 2026.

**Which products and versions are affected?** 1Panel-dev MaxKB 2.10.3-lts and earlier.

**Is there a fix for CVE-2026-77523?** 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-2026-77523 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-77523?** 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 model parameter form endpoint performs workspace-level authorization checking but the ModelSerializer.ModelParams class queries models by ID alone, omitting workspace_id filtering. An authenticated user with model read permission in any workspace can call /workspace/{attacker_workspace}/model/{victim_model_id}/model_params_form with a known victim model ID to read or PUT malicious parameters. This requires authentication and knowledge of a target model ID but allows cross-workspace integrity and confidentiality violations.

## Affected products

- 1Panel-dev MaxKB 2.10.3-lts and earlier

## Timeline

- 2026-09-21: disclosed: GitHub Security Advisory GHSA-g888-8cvh-9284 published
- 2026-09-02: other: Advisory privately reported to MaxKB security team

## References

- [https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-g888-8cvh-9284](https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-g888-8cvh-9284)

## 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 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)
- [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)