What’s Vulnerable › Vulnerabilities

CVE-2026-75851: ArcadeDB before 26.8.1 Authentication Bypass via Async Command

• Severity: critical (CVSS 9.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-18 · updated 2026-10-22
• Weakness: CWE-269

Description

ArcadeDB server (com.arcadedb:arcadedb-server) in versions 26.7.3 and earlier fails to propagate the authenticated principal to asynchronous command worker threads. When an HTTP command is submitted with awaitResponse:false, it executes on an async worker whose DatabaseContext has no bound user, causing the scripting authorization gate to become a no-op. A user with only read access to a single database can submit an asynchronous JavaScript (language=js) command via the /api/v1/command endpoint to run code with unrestricted host access (e.g., database.getSecurity().createUser) and create a server-wide administrator, escalating to full administrative control. Fixed in 26.8.1.

Affected products

• ArcadeData arcadedb: before 26.8.1 — fixed in 26.8.1

How to fix

Upgrade to a fixed version: ArcadeData arcadedb 26.8.1. Check the vendor advisory for mitigations.

References

• https://github.com/ArcadeData/arcadedb/security/advisories/GHSA-5j4x-3jfw-8xv3
• https://www.vulncheck.com/advisories/arcadedb-before-authentication-bypass-via-async-command
• https://github.com/ArcadeData/arcadedb/security/advisories/GHSA-5j4x-3jfw-8xv3

Get alerted when CVE-2026-75851 or the next vulnerability affects your stack