Vulnerability · Published Aug 18, 2026 · Assigned by VulnCheck

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

Critical 9.9

In plain English

A critical-severity privilege mismanagement in arcadedb from ArcadeData. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities).

Severity (CVSS 3.1)9.9Critical

Exploit odds (30 days)0.4%top 66.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
ArcadeData	arcadedb	0 – before 26.8.1

Weakness: CWE-269 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References

GitHub Security Advisory (GHSA-5j4x-3jfw-8xv3) vendor-advisory
VulnCheck Advisory: ArcadeDB before 26.8.1 Authentication Bypass via Async Command third-party-advisory