---
id: CVE-2026-75845
title: >-
  ArcadeDB versions 26.4.2 through 26.7.3 contain an authorization bypass
  vulnerability in the set_server_setting MCP server-level tool
summary: >-
  ArcadeDB versions 26.4.2 through 26.7.3 contain an authorization bypass
  vulnerability in the set_server_setting MCP server-level tool.
  SetServerSettingTool.execute() gates only on the global allowAdmin flag and
  never checks the caller's …
severity: medium
cvss: 6.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L'
cwe:
  - CWE-269
published: '2026-08-18'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:32:39.347'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-75845'
references:
  - url: >-
      https://github.com/ArcadeData/arcadedb/security/advisories/GHSA-pff6-hp53-pj54
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/arcadedb-before-authorization-bypass-via-set-server-setting
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/ArcadeData/arcadedb/security/advisories/GHSA-pff6-hp53-pj54
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00209
epssPercentile: 0.11345
ingestedAt: '2026-09-08T21:11:12.280Z'
---

## Overview

ArcadeDB versions 26.4.2 through 26.7.3 contain an authorization bypass vulnerability in the set_server_setting MCP server-level tool. SetServerSettingTool.execute() gates only on the global allowAdmin flag and never checks the caller's role, so in an MCP deployment with allowAdmin=true and a non-root allowedUsers set, any authenticated read-only user can invoke set_server_setting to modify server GlobalConfiguration, enabling configuration tampering or denial of service. The issue is fixed in 26.8.1.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.